These services show ads in ways that delay you accessing the content you want, banner ads, while annoying do not have that property and are a harder sell
reddit did it years before all of those.
Youtube probably conceded that adblockers does it anyways for powerusers.
There are ads in YouTube premium? What is the point in it then?
There are no ads with premium.
There are not ads in YT Premium. The comment was listing services that sell the ability to hide ads.