Have you missed the part of my comment of my comment where I specifically mentioned "web advertising presence"? That's relevant, because ublock would only work on web ads. It can't block ads in the app store, or any other app (eg. spotify).
https://github.com/search?q=repo%3AuBlockOrigin%2FuAssets+ap...
Thus they also clearly have an incentive to sabotage uBO. It may be a much smaller piece of their revenue than at Google, but it is a huge proportion of their revenue growth. Don't believe Apple's marketing about their caring for privacy, belied by their actions.
Can you link to a specific rule that shows Apple has web ads? The search results you linked either removeparam filters (which I guess is "tracking", but probably the most benign kind), malware sites that contain "apple.com", or analytics domains that seemingly belong to apple. Moreover there's no evidence that Safari's content blocker restrictions make a difference here. The domains are trivially blocked so it's unclear how apple is materially gaining from their nerfed adblock.