If you don't take risks, it's almost impossible to win. Casino owners know this and set up games in such a way that the player loses money with small bets. I can judge this from my own experience. How many times have I placed a small bet and the entire deposit has evaporated. As soon as I started taking risks and increasing the bet, the result was not long in coming. I used this strategy quite often, if you can call it that. I managed to bring in quite large X's. Therefore, everything is relative for everyone. There is no universal approach to gambling.
It's so easy to explain. For example, for roulette, the longer the game session (for example, the more spins) the more House Advantage grows. Therefore, it is difficult to win big on small bets. Therefore, the bets should be higher with fewer spins. However, this reasoning is not entirely correct for slots, as slots have huge multipliers and large winnings with a large number of spins and small bets, it is more a matter of luck and RTP than a House Advantage.