Fraudulent behavior on the part of online casinos has been documented. The most commonly reported behaviors are refusal to pay withdrawals or cheating software. Online casinos who have multiple confirmed cases of fraudulent behavior are often called “rogues” or rogue casinos by the online casino player community.
One commonly reported behavior related to refusal to pay withdrawals is the refusal to pay withdrawals promptly, in hopes that the player will continue gambling with the money in the account and lose it all back.
Cheating software appears to be less common than payout problems.
Some casino software has been mathematically proven to cheat, such as Casino Bar (evidence by Michael Shackleford and others). Elka System/Oyster Gaming software is known to cheat, also confirmed by Michael Shackleford. Statistically non-random video poker has been reported at Playtech, see article “OCA STATS”. Screen shots from the back office of an older brand of software indicated the odds could be adjusted by the operator.
Much of the speculation about casino software cheating is usually the result of a player finding a pattern in a statistically small set of results. Most people in the online casino industry believe that most of the major casino software brands offer odds and paybacks that are the same as their land-based casino counterparts.
Many casino gambling portals and player forums maintain blacklists of rogue casinos. These can easily found in any major search engine, but most of them constitute indvidual webmaster and player opinions rather than anything official from any type of regulating body.
Fraudulent player behavior
Common fraudulent behavior from online casinos players includes the signing up for multiple casino accounts using different identities in order to claim a bonus offer multiple times. Another form of fraudulent behavior might be the use of a graphics editing software like Adobe Photoshop to create a false winning slot machine game screenshot in an attempt to tell the casino they hit a jackpot and didn’t get paid for it.
Online casinos usually lock the player accounts for these people, and it’s widely believed that online casinos share fraudulent player blacklists.