It would probably be a separate site like https://lishogi.org or https://lidraughts.org (both based on the Lichess engine). Or, it might be added to https://playstrategy.org/ (which is the Lichess engine with a bunch of other abstract games added)

What do you think of the existing go offerings online?

Not as good as chess.com

Go world is mostly on websites only (not mobile native apps). Also the largest servers are In Chinese with minimal English translation (fox).

No standard equivalent of stockfish engine integration (while we are here, stockfish please add go support).

On baduk subreddit, top recommendation is goquest, which is like flappybird compared to super Mario brothers.

No 9x9 ladder climbs on YouTube to learn from like chess rating climbs by GM’s like levy and Aman.

Not sure why you’ve been downvoted. It’s not an unreasonable suggestion; chess.com already has loads of weird variants like Duck Chess.

Thanks. I love chess as well. But go is under marketed in the west and has potential in the rest of the world (non chinese).

have you tried https://online-go.com/? it looks very featureful