As the other commenter already said it’s an abundance of caution. GItea is already moving in the direction of SaaS and an easily self-hostable solution runs counter to that plan (Gitea is already offering a managed Cloud so this is not a hypothetical). One thing that has already happened is Gitea introducing a Contributor License Agreement, effectively allowing them to change the license of the code at any time.
oh boy that would be one hard sell. Probably would need 500k or more to justify never listening to them again