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.
I pay for Discord Nitro because it’s where the vast majority of the people I have real interactions with online are and I like being able to send my own emojis outside of my own server. I also like having better audio and video quality for my server’s voice chat. Dumb, maybe, but it’s literally less than a club cover fee per month.