Facebook runs ads and tracking inside the Facebook app. Apple isn't stopping them from doing that, it's just making users aware of how that sausage is made. It's not like they are showing their own ads inside of the Facebook app.
The App Store today is barely any less skeevy that app stores of old, like GetJar.com or whatever I was downloading apps on for my Win Mobile 6.1 BlackJack phone in 2007. If they choose to weigh it down with even more ads, that's their prerogative.
lets just call a spade a spade. For better or for worse Apple's steps are essentially screwing up facebooks business model. Now to do that out of "privacy concern" is at the very least, morally bankrupt
As to your second point about App stores 'skeevines', i shall concede to you due to lack of knowledge.
As to making more ads being a prejorative of Apple, i'm still not happy with ads and certainly not more, and less specific ads.
If you need an argument in support of why Apple's move is really targeted at publishers like Facebook, take a look at the ATT/app tracking transparency prompt that Apple have designed.
It doesn't call out any of the benefits of allowing tracking (healthy for the free app ecosystem, helps publishers), rather it's just:
"Allow {app} to track your activity across other companies' apps and websites?"
They chose to become a sharecropper on Apple's farm.
Facebook still works on web browsers and iOS offers one. Whatever problems Facebook has with that are shared with all other websites that don't want third party cookies blocked on iOS. Facebook hasn't been personally targeted here.
It is a huge deal. Apple is screwing up facebook, in order to promote themselves. I'm shocked if there are no anti trust implications.
Facebooks own challenging behaviour needs to be adressed, of course, but by taking this alleged step, Apple is demonstrating that we shouldn't rely on them to do so.
Besides, i hate irrelevant ads coming up on my search results, and apple don't even have the miserable excuse of needing the income to maintain their Store.