My experience has been exactly the same. A big push from Apple to use it but reports do not get any kind of acknowledgement or response.
DownUnderGlen
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It would be great to know Apple's response to this. We use a blocker on a WkWebView but do not receive any feedback on what is blocked; not even basic statistics like how many things were blocked. The only recourse I know of is reparsing the ruleset over a domain yourself which is obviously very inefficient and potentially error prone.
This means we are unable to easily report anything back to the user. The only indication a user gets that blocking is working is that a webpage is missing content or not working as expected (e.g. sign in flows often do nefarious stuff and fail to work with a content blocker being employed). There only recourse at this point is to whitelist that domain.