Safari content blockers don’t get access to the website. They merely present a list of selectors to block, and Safari does the rest. So the lack of source code access is benign, by design.

Content blockers don't have access to websites, but they themselves need to be "hosted" within a native application, right? And that application can potentially do more than just provide a list of rules to Safari.

Along with any other application...on your phone, yet you don't ask for the source code to those?

I should have specified I'm talking about macOS.

Ah, so you mean you want a free solution, because why should the devs of an extension that you obviously value earn anything from their work?

I want a free solution because that's the standard in the space. I shouldn't have to pay money to make a browser with less features have parity with a better developed one.

Speaking only for me, I'm OK with paying, but trusting browser extensions, as they currently exist, is hard.

Do you know how Safari content blockers are implemented? They by design cannot do much malicious stuff.

Well that’s why they’re adblocking to begin with - to prevent monetization