I've been doing the same thing and yeah, you're right it's a total waste of time, especially if you don't get any chat rain of what you want. But if you're lucky enough to get some $ in chat rain and turn it into a decent amount, that's a different story. I did manage to withdraw twice from some online casinos without making any deposits because of the chat rain. So it doesn't always a waste of time for me.
It's true that it's a waste of time but there's fun in it if you're enjoying it and have a lot of spare time. But to shortcut it, bc.game runs a lot of giveaways on the games and rounds, most of them are prediction contests.[
I still remember withdrawing the first week's payment from BC and after that, it was stopped due to the issue you pointed out. I was again able to withdraw two or three times without any KYC requirement. As per their TERMS OF SERVICE (section 6), they can ask for KYC whenever they can and I am quoting what is written below.
I also remember my first time of withdrawing, I was able to sort it out and it's just all about the wagering requirement before the withdrawal happens and after that, I did a couple more withdrawals without any issue and kyc. The new members might have problem with that if they're new and don't wager a lot and then wants to withdraw asap, most of the casinos won't allow that to happen and it's either proceed with the kyc or follow the wagering requirement.