Open weight models should have GPL-like license where it says if you train model on it, it needs to be open weight as well.

Yes, and not only that but you can't even access it via API, you can only use it in Devin (formerly Windsurf).

I'm an OpenCode user, but I'll fall back to Claude Code if I want to use Opus end to end for something, given my company has a subscription. But I'm not using yet another tool and subscription for a model that isn't even winning.