Sure. Mastodon is written in Ruby on Rails, for example.

I think forums are the one type of website that’s simply impossible to make with Ruby on Rails. In fact, I don’t think any web framework can handle it…

I think your best bet in this instance is to code everything directly in binary. That’s what I would do

Edit: apparently I actually needed to add /s

Sure, but there are a gazillion forum websites already. I’d just use an existing one. The one D uses is the best I’ve ever used. I think it’s actually written in D, which is a very niche language but way nicer than Ruby.

You could but it’s no longer in vogue. Try Elixir instead.

there is only ultimate.cgi

I don’t know. Can you?