Fashion magazines are basically vehicles for ads. Even if you exclude sponsored content, a major draw of such magazines are the full page ads.
Secondly, Mozilla are not blind to the idea that tracking won't go away completely.
Because that's what 'relevant ads' usually means in contexts talking about ad blockers.
It's kinda shocking, but if you talk to non techncial people, they just accept adverts as a fact of life and actually quite like it when they show them things they like.
Hell, those "You looked at this item on our website last week, do you still want it?" adverts are incredibly successful. My company does them and they have (for adverts) a fantastic conversion rate.
The unwanted side effect of that is probably the little greedy voice inside people that causes them to buy even more things they don’t need because all of the dressing up made it sound appealing.
However, ads when I'm not looking for them can just fuck right off.
The same went for the gaming magazines (White Dwarf particularly). Even the ads that were just price lists were fascinating, just to see what was available to go and check out on the next trip to a games store.
It was probably about 95% ads and just a few articles. Before comparison price sites it was a good way to find cheap prices for computer parts
Trust me, there's a market for people who want ads.