Earlier quoted context omitted.
That does not answer the question in any way. Especially, since it claims to use zero CPU when active and because iOS ad blocking works differently.
> it claims to use zero CPU There is no claim of "zero CPU". The claim is that the service worker wakes up only when necessary -- it is designed to be suspended by default from the ground up. In Optimal and Complete modes, the content scripts will of course execute, without the service worker being unsuspended if no filtering occurs, but perform only the necessary work and bail out ASAP if not needed. In Basic or "No…
I'm still confused about what level of access is given to the extension and what using the extension means. Clicking on the extension asks for access to the current website, so I'm assuming that without giving access there or clicking "Always Allow on Every Website..." in the Safari settings, the extension does not have access to the web page contents.
Basic filtering claims to not require permission to read the web page data. But the extension is still used and does content filtering right?
Maybe this is more of a comment on Safaris weird terminology in the permission settings.