Regarding forums, a few that I used to use have had to go "members only" or use firewalls like Anubis because of scrapers. It is frustrating for some users because they can't even use a regular search engine to look for things on their own forum. (This even pushed users to Discord!)
I do prefer having things open, and especially prefer not having to make an account. So I hope that forums stay mostly open and not members-only.