I have not played an online cash poker game in the last 10 years.
Prior to that for several years I had cash accounts at 17 different poker sites and never had a payout problem with any.
I did very well in the cash games at Poker Stars back when Texas Hold Em was all the rage. But the games dried up
when the most reputable sites banned American players due to usa government pressure fear of money laundering.
Had my cash seized by USA government at 2 sites "For My Protection" and it took 2 years to have it returned (without interest) Poker Site transfers were always completed for me within 48 hours and seemed safer than when the government got involved.