So first of all, I did not play the game but am involved via discussions with my kids.
Second, my kids do not play the game because of the withdrawal possibility, but because they have fun to play there with their friends from school or new friends they made.
Third, how much they made: Since my youngest son already plays on another Minecraft server with his friends, he tried Satlantis for 2 weeks, but has quitted and sold everything to his brother for something near 40$ (traded in game for satoshis) only to buy other stuff on his main server via paypal.
His brother, my older son, is still playing on the satlantis server, has invited some of his school friends in to his clan and the clan is now the second best by hashrate on the server. He and his friend have cashed out together only 50$ each, just to be safe if something happens with the server they have something to get stuff on another server. (Backup plan).
My daugther skipped the first weeks but got later into it and joined the clan to play with them.
All in all if you are someone who wants to maximize the cash out, you have to grind as in every game and trade with other players and provide them the things they are looking for. There is an in game auction house and a discord trading channel. And if you can invest into in game asics and have enough time to get emeralds to feed the asics you get sats during you sleep.
I can only estimate that one can make around 100$ a week but could be more or less depending on the investment into asics and time for grinding/trading.
if my older son would like to quit, he would need to sell all of the stuff he "owns" on the satlantis server. If he would manage to sell all his stuff for the normal price without dump it all at once, I think the items are worth some thing about 400-500 $ right now.
All transactions for withdrawal were supervised by me, so I gave the fiat money to the kids after the sats were sent and received on my lightning wallet.