A lot of instances did, the flagship instances run by the Devs of Mastodon didn’t. They think that it’s good and want to encourage it, though at the same time their instances have a spam problem so bad many instances have decided to limit them, making it harder to follow people if your account is on them.

Also noticed that many people say they won’t follow people who are on Mastodon.social or approve follow requests. Which is a bit extreme but I also get it, there’s lots of spambots and not great people on those instances and moderation is slow since they’re so big which doesn’t really help.