There’s a very simple reason that artists don’t worry about selling out anymore (a phenomenon that was much more widespread than just the early 90s): the music industry finally finished their project of extracting nearly all of the money. These days, you’re more likely to have a hit because your song was in an advert than have your hit song used in an advert. Merchandising and the rest is pretty much your principal revenue stream.

This 2014 song nails that: https://www.youtube.com/watch?v=PuQt9N4Dsok