No, there is, in any casino, you can see in Bets history, that all bets are very small, of course they follow some strategy, for this there is a separate section for Big Bets, which indicates that these have made a real bet that does not follow any strategy, and we find it It always increases at a small rate every hour (whether it is from the same person or different people) in popular casinos, while the Bet History increases by more than 10 per second from different people.
How come you came up to the conclusion that martingale is preferred by most gamblers right now as their betting strategy just by looking at bets history? Do you see a long streak there with a martingale betting? And it should be done by different users and not just one.
Well then, if that's your source then so be it and I won't argue with that.