As employee and/or employer I would go for more local/vertical websites/newsletters. There's no community such as StackOverflow outside of it, so you have to narrow down your scope somehow. Posting on LinkedIn is a mess. I've talked with many people looking for devs and they pay a lot of money for a lot of low-quality applications, it's even worse for remote companies: If they specifically state they look for people in EU timezones they'll receive anyway 100+ CVs from India or other countries.
So, LinkedIn is a mess, general job posting websites miss all the stuff a developer/company hiring developers needs, I love HN jobs but it's too much of a niche, remoteok or similar are too broad in scope.
There's space to build stuff and make some money if you play well your game.
Shameless plug: I recently launched one newsletter for remote-friendly companies hiring Italian developers that already reached ~900 subscribers and I already received requests for sponsorships. So there's interest in these kind of stuff.
www . fullremote . it
info @ fullremote . it if you want to reach out. :)