I think this is a question of clearly explaining the existing flagging functionality in Discourse in detail to the reviewer. I’ve had to do this before for Apple’s reviewers, it’s possible that Google’s reviewers need even more specific screenshots/details included.
Core certainly provides many options to do this, that’s what flagging is, a way to report violations by users. We don’t let people go to the user’s profile to flag a user, but from posts, they can certainly be flagged.
And once a regular user flags another one, admins/moderators can very easily suspend/block that user globally. You might need to show some of those screenshots to the review, but the features in Discourse for this are quite solid.
There is a statement by default that users agree to ToS and privacy policy when creating an account:
And over the next few months, we will also add the ability for sites to add a consent checkbox that users must check, both when signing up and when logging in (for example, if the policy changes so much that admins need to request a new acceptance by all users).