the problem is, so many people tend to overlook reading the terms of conditions on sites that's why people get stucked on the site not knowing what to do. also the thing that worries me the most is that, you need some good recommendations from someone who is a trusyworthy user on that site since some reviews can be fake too. i have tried various gambling platforms out of curiosity and most sites i visited have different rules in which they focus on their specialty offered on their house and being not able to withdraw to a ceratin threshold is pretty common on those sites like dice, slots and those fast money-making games.
I don't think there can be a bigger mistake than a gambler using a martingale strategy in a game where the chances for the house to win are way more than themselves, but not reading the terms and conditions is an even bigger mistake than one should never make. It only takes up a few minutes of your time and can save you a lot of time and money.
Most people try new platforms with the hope of getting some bonus with their deposit and then maybe gambling their way to the top and withdrawing some, which barely happens due to the wagering requirements of the platforms.