Chess.com has plenty of value, it just isn't as free or open as lichess.

Cheds.com supports more game modes / variations (bughouse and puzzle rush are two favorites!), better social features, built in lessons and lectures you can buy or subscribe to, the client is snappy and lets you set up a sequence of premoves instead of just one, etc.

Lichess also has some killer features of it's own: everything is free, including tournaments, the titled arenas are nice, the analysis tools are free and easy to use, etc.

There doesn't have to be just one platform. A paid and open source platform can both offer different value propositions even if there's some overlap.