All casino games are configured to give casinos a mathematical advantage, which leads to the casino always being profitable in the long run. This is a direct consequence of the mathematical laws that are present in casino games.
The mathematical laws dictate that as long as the odds of individual outcomes remain unchanged (so the game has a fixed rate of return to player (RTP)), so no betting strategy can give players an advantage over the casino.
As long as bonuses are not part of the equation, it makes no sense for casinos to ban any betting patterns and strategies. The only consequence of banning them is a worse experience for players, and for this reason, good crypto casinos without KYC don't do it.
When a player receives a bonus, it is often possible for them to meet the wagering requirements, while losing statistically less than the value of the bonus. In this way, players can actually be profitable in the long run. But could this be considered cheating? Definitely not.
Casinos often argue that players should play for fun, not to make money. While this makes perfect sense from a responsible gambling point of view, the possibility of winning money is definitely part of the fun. Labeling players as cheats just because they want to win makes no sense whatsoever.
Casinos have an advantage in all casino games and control the bonuses they offer to players. There are many common rules that limit the ability of players to abuse bonuses, such as maximum bet, maximum win, wagering requirements, decreasing the contribution of certain games to wagering requirements, etc.
If a casino sets up its bonuses in a way that allows players to gain an advantage thanks to them, the fault lies with the casino, not the players. As long as players comply with other fair terms and conditions (such as opening only one account, playing under their own name, etc.), bonus hunting is perfectly acceptable.
Of course, if players open multiple accounts or use other people's dice to play, they should not get paid; however, not because of the use of betting patterns or strategies, but because of the violation of other rules.
Last but not least, any form of gambling can technically be called a 'betting pattern'. Rules prohibiting betting patterns are often very subjective and can theoretically be used against all players.