This is information that has been dug up by me and others in the Unity community. It's not official information from Unity (but most of the linked resources are). It is also not legal advise. I am not a lawyer.
Contrary to what Unity themselves are saying, for games made with these Unity versions, developers can elect not to be affected by a newer version of the Terms of Service that introduces the Unity Runtime Fee:
- Unity 2022.x or earlier
- Unity 2021.x LTS or earlier