Thank you for your feedback. Yes, block page does not provide any information on the category itself. The category information for specific page in the block page will be taken into consideration for future improvements.
We are also considering various reporting possiblitities for example reporting false positives with most easiest way. These are under discussion for future releases. Most likely end user will not have this possibility of "re-categorization" in the blocking page as the enforcement of the categories will be done by IT admin and end-user should not be able to do this.
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