I use Adguard/wipr to great success. Why's uBlock Origin better? Also, wipr now has filtr, which provides URL filtering at the macOS level, so it's as efficient as it gets.
Quick question: how do you distinguish content blocker extensions from regular extensions? All the Adblockers I know have to use both to be effective at hiding ads, especially on YouTube.
In that case, the new owner can still do the spying.
“"AdGuard — General" does not have permission to read or transmit content from any web pages.”
Ones that have more permissions will say so.
I swear there are little gaps in each that the others get, but they're very minor. When uBlock Origin Lote recently released on iOS (within the last year), I noticed a few more things blocked. I also prefer the custom element removal or uBlock and can reuse my desktop filters.
It's free, so I'd recommend adding it as an addition to the bunch.