and I stated before that players should always be ready for KYC , cause sites policies may change at any moment and we saw how even sites like Fairlay sometimes ask for the ID in case they suspect an abuse
* Should always be ready with another gambling site as as alternative -- FTFY
All the possible site policies you know of only comes into practice if a higher amount of win or a withdrawal is requited by the player -- Facts.Furthermore, abuses are only suspected when a withdrawal is requested and not when a huge amount is deposited.You should enlighten those websites and ask them WHY.
not necessarily , for example in Fairlay case they asked one of the players to send them their ID not because he won a lot of money but because he did some deposits without wagering so they suspected that he is using them as a mixer
also sometimes a site may suspect that a certain user is for example benefiting from the first deposit bonus many times so they may ask him for the ID as well