I used to run some pretty decently sized forums and did paid jobs customising forums for various niche hobbies. I’ve had more emails in the last 6 months asking me to help old forums get going again, than I’ve had in the last 5-6 years combined.
Most are going Discourse or Vanilla, some are wanting more custom things these days. All are saying that their userbase (that previously migrated to Reddit) are all crying out for an off-Reddit solution.
Reddit did a Digg, which is endlessly hilarious.