(Obvious disclosure, I am the one running the service)
If support for open source is what you are looking for, may I suggest taking a look at Communick? It basically takes the open source alternatives for social media and messaging platforms, and packages them for easy access and setup. There are packages for Mastodon, Lemmy or Matrix each of them for less than $10/year and fully managed. I'm pledging to take 20% of the profits and contribute to the upstream projects.