TBH I don't know what's the right solution.  I like caps, that sounds like a good idea, and that cap is lifted if you create an account.   Yeah, reverification is very annoying.  Best if done once and added, and we can trace back in case it was an improper source.  Likely no you won't get sued for accidentally using an improper source, the data will just get deleted and OSM will be safe from copyright infringement.