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They are indeed a great example of an OSS success. Their website is great, apps run smoothly, great community and a very active founder - he insists on the project being open and adfree forever, supported by patrons: https://lichess.org/patron

I'm also unaffiliated, just a user.

Quite serendipitously you reminded me that lichess.org exists. Thank you for that.

Can also recommend lichess. Been playing there for a couple years now. They're a registered non-profit, and none of the features are hidden if you choose not to donate.

And written in mithril.js, no less! :)