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what discord things?

It supports Discord webhooks[0].

[0]: https://github.com/go-gitea/gitea/blob/main/services/webhook...

They're just webhooks, not sure what the issue is (?)

Is it possible to not use the Discord things?

No fan of Discord but from what I remember the functionality is opt-in and if the webhook is not configured it does nothing.

Among all the possible things to get worked-up about this seems like nothing (unless you are purist that considers including optional functionality to interface with a proprietary-service to be harmful).