Gotcha. That means if I run Next for just frontend + server side rendering stuff then I can always self host it?

Sort of, so long as you don’t care about more complex hosting strategies eg hosting some/all of your server side code on edge servers when users visit your web app - as opposed to always sending them to a server in a set location in the world as a “normal” server architecture would typically do. Alongside not caring about prerendering and caching some pages and not others, that kind of thing