Because this is the most well-known strategy in gambling and can be a trap for novice gamblers, because they only think that it is important to have large capital and keep raising bets because they will definitely get a win after several defeats, novice gamblers may not know about casino limits, and after they experience it, they understand that this is not an easy strategy to be able to benefit in the long term, several attempts are possible but in the long term it will only bring the player to lose all of his balance.
Is there any effective strategy that would allow you to win at gambling all the time? I don't think so. In fact, any strategy will be futile sooner or later because any casino will always keep track of it and, if necessary, make the appropriate restrictions. So I think there are only two options: either the user gambles for fun and relies only on his luck, or he tries to wager as much as possible to win prizes in leaderboards like high rollers do.