In the podcast they talk a lot about when to self host. Sometimes it makes sense, sometimes it doesn't. For example this podcast's community is on Discord, but for their other podcasts they maintain a Matrix server. It's interesting to hear them talk about the joys and pains that both solutions bring.
I used to run an email server from my basement, now I also know that that is not something I want to self host anymore :)
Ironically, not self-hosted (served from fireside.fm).