I know there was blackjack bots used to clear casinos bonuses wagering requirements. I just found one of them (called 'Bonus Miner') which is fully customizable: you can set it to take a break of a variable timeframe set into a range after a variable number of hands played, then it will resume play. You can also set it to have a variable number of seconds to make a play decision, and you can also set it to make mistakes after a variable number of hands which you set up.
It also have mouse movement, can be run in stealth mode (hidden from screen) and it will appear as firefox running process in your task manager. I am not promoting it, (by the way - it is free) but I am enumerating its characteristics because I think this will help me to get to my point of making this thread.
What I wonder, is if there are blackjack bots (with the same characteristics - because having all these characteristics it will be near impossible for the casinos surveillance teams to prove that you were using a bot ?) which are able to play any Multihand Blackjack game. (preferably which is able to screen read on any flash website and/or downloaded software) - I believe these bots would be able to heavily exploit Single Deck Multihand blackjack games (where the initial house edge is no higher than 0.27%) where you can set the bot to always bet the minimum on the first two hands and the maximum on the last hand in 3rd base, because it will be able to make basic strategy deviations implementing full indexes in play according to a full card dependent strategy based on the (at least 7) cards he sees out of the deck (~ 13.5% penetration) which will give ~ 0.45 in player edge, and so the game will turn on overall with a ~ 0.2 total player edge.
I believe you can play two full rounds which equals with 6 hands/1minute (depending of the casino software) which means 360 hands/hour. If the player edge is 0.2%, then the player will win ~ $24/hour at $1 bets for the first two hands and $100 bets for the last hand in 3rd base. This , in itself is some steady profit, but if the table max is $500 or higher ? Imagine that ! All a player will need is just to have enough cash in his account so he can use proper Kelly and beat variance.
And another type of blackjack bots I would be interested to know if exist, are (fully customizable - to avoid red flags of being labeled as a card counter) Live Dealer Blackjack Bot Counters. And by fully customizable I mean, you should be able to set it to never decrease its bet after a win, and never increase its bet after a lose - I believe this trick will blow anyone who is looking to detect card counters, But ofcourse it will cost some serious player EV, but as I have read on WizardOfOdds website, if you have enough spread and a game with not very bad rules, and a penetration of at least 66%, the game will still be VERY profitable.
On the internet you will not find any Live Dealer Blackjack game with a penetration higher than 50%, and this is very bad, that maybe (not sure) a spread of 1 to 15 will not beat the game. But I believe it still can be easily beaten with a higher spread, and as I see now there are rooms where will allow you a spread of 1 to 250, which I believe, can blow any house advantage on positive counts even if the penetration is tiny while the games are fair (no 10s missing or stacked) ?
Or you can set the bot to always (wong in and out) flat bet, but just stay in watch mode when the count goes negative (or TC=+1 and below).
Or you can set the bot to play a mickey mouse - bet $20 on counts of 2 and below and $90 on true counts of 2 and above if the game have good rules.
And this bot besides keeping the exact true count in very depth, should also keep track of all cards dealt out of the remaining decks and adjust its playing decisions according to this information also, plus it should have same characteristics as Bonus Miner bot in breaks and time to act. - Is there such a thing ?

Interesting post. Variance would be quite high spreading 1 to 250. I do not think the teeny advantage you may gain outweighs the possible problem of not being paid if you actually do win. And lets not forget someone on the other end might just dedcide to fix the game against you, leaving you to appy to Marunastan's court system for your complaint.....

this is called depth charging, and has been around since before the internet. it works if you spread enough and play perfectly, but it would quickly be spotted by their management and they might not pay you, like soopoo said

Good luck finding an operator who will pay you after the obvious 1:100 spread on single deck.

Shed not for her the bitter tear Nor give the heart to vain regret Tis but the casket that lies here, The gem that filled it Sparkles yet

I've said it before, and I'll say it again. Why play at an online casino?...there is a very real chance they're not paying you. Especially if you play with a BJ-bot. That just gives them a plausible reason not to pay you. Don't do it.

Well, I am not very enthusiastic after reading these responses .. I agree that there may be a pretty big problem in finding a group which will pay (and not reject from further play) after one guy wins a very large amount. Though, I don`t know if that is the case.
But in what I am interested for, is to find out if such bots do actually exist and can be used, or some geeks keeps those in secret ?

Shed not for her the bitter tear Nor give the heart to vain regret Tis but the casket that lies here, The gem that filled it Sparkles yet