When your job depends on it you tend to work really hard at believing that advertising is necessary and actually it's good, actually actually relevant ads are helpful! After all, if it wasn't then what am I doing with my life?

In the case of advertisers that'd be mostly lying and manipulating people while hurting them by enabling a dangerous system of surveillance that threatens themselves and their families along with the rest of us. If I were an advertiser I'd probably want to lie to myself too.

>People used to literally pay to have their own website in order to get their ideas out there.

Somewhat; at first, this was the case, though I'd say many of them were simply using their university's computer resources. Later on, banner ads happened and then we had sites like Tripod, where people could build their own simple website and not pay anything for it. Somehow, these sites did just fine (for a while) by hosting banner ads. These days, somehow it supposedly costs a small fortune to run a simple website even though computers are FAR more powerful than they were in 1999 and computer hardware generally costs much less.