the bots work yes, they play perfect strategy, take breaks at adhoc intervals and occassionally play the odd hand incorrectly
there was a time when they were publicly available, now they are “commissioned” privately
they are the sole reason most table games are weighted so poorly now with turnover requirements and have caused many a casino to go out of business
i know of stories of russian/eastern european “boiler rooms” where they would create hundreds of identities and run through the same casinos 24/7 , which is also the reason some countries are restricted on receiving them and why places like moneybookers and neteller now have much more stringent identity checks in place
these days its a very quiet, private thing, but there was a time when it exploded
most operators do have clauses banning their use , and there are constant spy systems being built for operators to indentify them