That depends! You can run an instance on an old PC for just yourself and some friends for next to nothing, but a bigger instance with lots of traffic can easily climb to hundreds per month or more. No idea where we’ll end up when things slow down, but the subreddits this server represent currently have more users than the entire Lemmy-verse 😅
I’m just trying to get a rough idea of the order of magnitude. Has this instance exceeded “old PC” (For discussion’s sake, an 8 core i7-9700k with 32 gigabytes of RAM) yet?
Your definition of “old pc” is much nicer than mine. No we’re not there yet! But likely within the next few months. Lemmy.world recently made this post which you may find educational.