In their terms and conditions, casinos almost never provide an explanation. However, the games that are prohibited are the same at every casino.
There is a recurring theme across all of the games: low house edges. Depending on what game you play and the wager you place, the house edge at roulette ranges from 2.70 to 5.25%.
Therefore, I would hazard a guess that the reason casinos forbid you from playing these games even though you may have an edge (however little it may be) is that the edges are so negligible that the short-term variation might very well benefit the player.
There is a recurring theme across all of the games: low house edges. Depending on what game you play and the wager you place, the house edge at roulette ranges from 2.70 to 5.25%.
Therefore, I would hazard a guess that the reason casinos forbid you from playing these games even though you may have an edge (however little it may be) is that the edges are so negligible that the short-term variation might very well benefit the player.