The developers got hired by a company which is the latter.

As for your data, you can make a decision after reading this: https://blog.omnivore.app/p/details-on-omnivore-shutting-down

Saw this post on “All”. Last I checked (sometime in 2019), self-hosting was a fairly involved process.

Has the process simplified enough for a complete beginner like me to begin self-hosting services on, say, a raspberry pi?

If yes, can you please point me to a good resource/wiki?