Originally posted by FissionChips:

Mods aren't officially supported, and even if they were the most IG could do about it is not host their mod - which they're already not, because they don't support mods.

I suppose IG could try to block specific mods from loading, but that's ♥♥♥♥♥♥♥♥ than paid mods.

In a recent blog post that included a Dev being interviewed, it was mentioned that official mod support if probably coming. The dev is an Irongate programmer that mentioned that it will likely need to be released after Valheim leaves early access, so mods will not be so easily broken in an update.
1h15min
https://www.youtube.com/watch?v=WjXIrRFgpR0&t=8634s