Why has mastodon.social gone invite-only two weeks ago? I grew tired of it being used as a hallway, where people enter, make a mess, then move on. It is my home, and I've put a lot into keeping it fast, secure and up-to-date.
Being invite-only means safer timelines, primarily, as trolls and people whose first instinct on a new social platform is to upload their uncensored dick have a harder time getting in.