Larger orgs probably have their own website, and could put it there and/or make an RSS feed. That’s old tech, and probably not as popular because it can’t be monetized like twitter/facebook/etc.

There’s also email, which is typically free. It’s less fancy, but it’s also very open. You don’t get good discoverability, though. Some bands I like send out newsletters and that’s how I keep up with them.

Lastly, the fediverse exists. It has some of the problems of social media, but at least it’s not owned by a handful of rich assholes.