To be honest the best thing you can do if you want to play poker and earn a reasonable amount with it, is to stick with fiat currency platforms. There are several platforms out there in the fiat currency world with several thousand, even tens of thousands, of concurrent players at any one time. The wider the pool of players, the more likely you are to be higher in the skill ranking and be able to make some sort of profit from this game. If you go to SWC, probably the most well known crypto site, you might be playing against 150 people at times - they might each have years of experience and you are literally playing in a pool of sharks who do this full time and are ready to grind away your money. Unless you are absolutely top tier, you will eventually leak it all to them.
He shouldn't be here anyway if all what he wants is a fiat poker site but since he is here asking I assume that he wants a crypto poker site but you have done a great job there because you recommend him a good poker site which only works with crypto.
Crypto sites can be still new compared to fiat gambling sites and crypto users aren't really into gambling but if OP has some skills in poker he has a chance to score a win and he cant lose easily from his opponents. It is the fiat poker site that have the best poker players. We even saw them in the TV or in youtube where pro poker players around the world gather and competes with each other to win millions in prizes.