I had a candidate actually do that for a similar problem.
They were like 15 classes in to generate fibonacci numbers, it was wild.
Honestly, I'm interested in knowing some of this too.
https://join-lemmy.org/docs/en/administration/administration.html says about 150GB RAM and negligible CPU usage.
I assume an instance with users subscribed to active communities requires meaningful storage, but I'm not clear the sizes we're talking about (what's data growth per/day been like for some of the larger communities).
EDIT: Likewise, I'd love to know if that 150GB RAM is fixed or whether that number grows with use.
It's less of a "UK/GreatBritain/British Isles" thing and more of a "You can have gmail/hotmail/outlook/etc and all have 'email'" kind of thing.
All of them are speaking the same language/protocol so they all talk to each other even if they do things differently
Mastodon is probably the most different since it's trying to be Twitter which is a very different "thing" than Reddit.
Those are probably the highest profile examples.
Everything else is way smaller scale, and often more about the tone than even what is being said. There's a general "how dare anyone push back" or a complete failure to understand what life is like (some of this overlaps with the "ok boomer" stuff).
I'd point to:
It's not like I've been keeping a list but those are what come to mind first.
Unless something changed Up/down Votes on Lemmy/kbin aren’t exactly secret