It works anywhere a Google ad works.

It's on the ad network side so I would expect it to work everywhere.

But how does it know that I'm me? My Google login? I don't think I'm logged in to Google everywhere. Just curious as to how this thing works, basically.

More importantly to me: I don't want to login to a Google account. $10 - $15 is a fair price, but I don't want to login.

I feel that if I pay for something and it now requires me to have an account I'm getting a worse experience. This is especially true in this case where a free product like uBlock will yield a better result.

Probably, but it might not solve the problems you have with ads, if those problems are tracking, page size, load times, or screen real estate.

It works for me.