[paltor]

I don't think that would be much different from "renting a billboard to place whatever you want on it".

If what you put up on that billboard is an ad, then it's advertising and would be covered. If not, it wouldn't. So you could rent a spot on the website, but you couldn't put promotions on it.

This would be distinct from ordinary web hosting because you're not just renting a space on a site, you're also renting exposure (a spot on some other website).

Sure, you could probably find edge cases - "what if I put a table of contents on my page with every page URL on every site on my web host on it" - but the distinction would be clear most of the time.