But it can be. Engine fixes are also OTA, it's the same thing really.

Do you mean OTA as in pushed with OS updates? I meant something more like a bunch of dynamic rules that can be updated daily or similar.

Yes, good point. I thought of it as minor safari updates, but small daily packets makes sense.

I guess another issue is that most of these have actual logic in C++, so you'd have to move some of this code to JS (I believe Firefox does that (the JS part, not the sending code part)). Sending code is a bit of a security concern though.