I wanted to search for the best e-scooter on the Swedish market and instead of doing site:reddit.com I did site:flashback.org and was satisfied with the results.

Flashback.org is a standalone Swedish forum that has stuck in there for over 20 years. Warning that it can be rather NSFW.

I wish I knew of more like it off hand but I know I've seen them, a lot of niche areas often have their own traditional forum. Like indie game devs, ham radio enthusiasts and so forth.

I think there is a psychological aspect to the type of people who are not happy just discussing their interests in a facebook group. That extra step of being an independent forum tends to attract either older nerds, or those who don't find social media attractive.

Therefore I wonder if there is a market in a forum platform, Forum as a Service. If you're using a forum platform, why not just use Facebook? Ethical reasons? I dunno, just speculating.