If you scaled Shin Jinseo to 2800, you would have players with extremely negative ratings. This page shows ratings of European players on a roughly aligned scale: https://europeangodatabase.eu/EGD/createalleuro3.php?country.... It still has negative numbers on it, and this only contains players who have attended a tournament (though it's more common for beginners to play tournaments in the west, since it's hard to find times to play).

It's not a comparison of the worth of the games (I play both, though I'm better at Go, and prefer it), but the dynamic range of Go is larger.

That said, any cross-game/sport comparisons of this kind are pretty tough to do properly.

>Go grandmaster Shin defeats AI KataGo with a two-stone handicap

English is not my first language but for clarity perhaps the title should be:

Go grandmaster Shin with a two-stone handicap defeats AI KataGo

Depends on what chess rating you're talking about. Online at fast time controls, where many many more games get played at than OTB classical, the top super GMs are rated in the 3400-3600 range.