I managed to get one second-hand from a friend who had upgraded. It was my first entry into self-hosting and running 24/7 automations, like public media archival scripts. Due to the popularity and forum support, it was pretty low-friction which allowed me to dive in easily without a mentor or excessive barriers. I had no hardware experience beyond assembling a PC from parts, so the accessibility was what gave me confidence to start.

A mini-PC would have been far more than needed, to the point it's wasteful for this kind of work, and the better embedded options (I'm sure there are plenty, and cheaper) were just too intimidating or manual to have drawn me in.