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Doesn't iOS 14 have DNSoTLS? You could use that to block ads system-wide. I've been doing this on Android with my own sever for several years now, and it's so surprisingly effective that I forget internet ads are a thing.

Apple has allowed content blockers in safari on iOS for several years.

Which are much less powerful than uBlock Origin and only work in the browser (which isn't an issue on desktop, but on mobile a lot of the tracking is also done by apps, so blockers need to be more than just browser-focused).

I use the Lockdown Privacy[0] app, it saves me from most of the ads, although, not from the cookie popups. It works pretty great and is open source.

[0] https://apps.apple.com/us/app/lockdown-privacy/id1469783711