Earlier quoted context omitted.
What makes you think paying for things would stop you being tracked?
Very good point, I'd never considered that! OK, if you don't pay then money has to be found somewhere for the web to still work[1] which advertising seems to be the only source of. Payment provides that cash thus squelching the need for ads. If they don't advertise then they don't need to track AFAICS. If they do start advertising as well as accepting payments for non-advertising, they are going to get spanked by use…
It's more of a content quality issue. There are examples where large numbers of people will pay for quality content (example [1]). Large swathes of 'content' is junk (clickbait, listicles, submarine articles, actual fake news, etc) and few will pay for that.
[1] https://www.theguardian.com/media/2018/jul/24/guardian-media...