Chess.com

The ultimate pay to win 1v1 multiplayer game. The actual game of chess is timeless of course but Chess.com offers you paid puzzels, computer reviews of your games, an opening database, statistical analysis of your games and more ALL FOR THE LOW PRICE OF A MEMBERSHIP. It's so profitable.

They want your money and they want you dead. Ads after every game. You need the premium membership for more than one game review per day. Vastly inferior to lichess. That said I still play here when I'm under the influence and don't want to tank my elo.