Most casinos offer a fixed amount I never used other platforms due to their high withdrawal fee.
Good casinos do not charge any withdrawal for payout. I have never gambled on a site long term if they charge any fees for payout. I mean, it is well known that online casinos are highly lucrative and if they also ask for money for the payout (admittedly, the fewest users pay out because the fewest win), then that is already an arrogance towards their customers.