I've done this for 10+yrs. Started with a single core Intel Atom powered netbook when those were still a thing, then moved to a quad core Atom desktop, to now where I have a 2nd Gen Core i3 desktop that will soon be combined with a similarly old 2nd gen i5 laptop. Runs half-a-dozen VMs, and like 10 or so different services, probably half of which are custom. At one point when I was still in school it even had a 5 person heavily modded Minecraft server (barely) running on it.

I'm basically the only user now. Its been a great learning tool.

Public access used to be through exposing the proper ports to the Internet, but now its through a Cloudflare tunnel and Tailscale.