Self-hosting is a community effort in which the whole community helps each other to self-host their data, including programming the services people use for this purpose. The problem with closed-source software is that we don’t know what’s happening behind the scenes, or if it’s indeed sending telemetry.

Even worse, if that service is ever no longer supported or updated, I’ll be left with data on my server that can’t be used to its full potential, and a service that won’t receive security updates.

Open-source software, on the other hand, is a community effort. If, for example, software is no longer updated or supported, it can easily be forked, and my data can be transferred to the new service.