Safari only allows extensions installed via the apple store, but every single adblocker there is a scam.
I'm not kidding you, I audited most of them. Chances are it's either a three years outdated list of adblock plus that doesn't catch anything or it's an extension that replaces all google analytics identifiers with their own to make money (even when it's a paid extension).
The only thing worse than Chrome is Safari at the moment. And Apple doesn't give a shit about anything there, I reported the malicious extensions to no effect at all.
So when thinking of the other side and "removal of choice" I don't have a healthier, audited ecosystem in mind...I have Safari in mind, which right now is a worse attack surface than IE6 back in the days when it comes to Privacy or Security.
Malicious extensions (as answer to comments). DONT install any of them, as I think they're scamware.
[1] AdBlock for Safari and Adblock for Mobile, which is an outdated AdBlock Plus fork: https://apps.apple.com/de/app/adblock-for-safari/id140204259...
[2] AdBlock Plus (which is the same scam model as other eyeo GmbH products): https://apps.apple.com/de/app/adblock-plus-f%C3%BCr-safari/i...
[3] Stop Ads https://apps.apple.com/lu/app/stop-ads-der-ultimative-ad-blo...
[4] 1Blocker https://itunes.apple.com/app/id1107421413
[5] Wipr doesn't do anything, literally https://appsto.re/us/thAB9.i
[6] Ad blocker https://apps.apple.com/de/app/ad-blocker-remove-ads/id153692...