I run lemmy.mindoki.com on a pc I built from spare parts (40€ dell plus for fun I got a hexa core for 50-ish and swapped out the celeron gold), only new "expensive" thing is the mechanical hard drive I guess but it's really not needed. I had it laying around and there were already an SSD. I also had the website so no hidden cost there either.
So it heats up my bedroom (but not enough, so the electricity cost is nil ATM).
Did you follow some sort of guide. I have some spare dell 730xd in my barn I wouldn’t mind tossing into my rack again. I just don’t have a clue on setting up an instance. I would also have to get this thing on its own vlan for obv reasons. Or a DMZ.