To make it clear to those who are misunderstanding: that’s a list of companies that host matrix for you. They do it at a good price.
If you and your friends chip, it’ll be a few bucks a pop per month to have your own private server with voice chat rooms and video chat rooms.
It’s all opensource and contributes to the ecosystem. Best of all, no age verification because the data is yours.
As you can read in the other responses that misunderstood the post, some people do not want to self-host and want something hosted. That’s the beauty of opensource though: whatever suits you.