I’ve thought the same about pre-ad Twitter and Facebook.
Early on, startups with free services look a lot like non-profits and just maximize user benefit to grow. The problem is they’re not non-profits, and have to make money at some point. That has tended to mean ads.
I’d easily pay, say, $9/mo to have access to an ad-free search engine that made me feel the way 1999 Google did.