The tag blocking is ambiguous. It contains stuff about blocking websites, unblocking hardware, email, and more.
I wanted to use it for blocking websites, but given the ambiguity I doubt about it. I ended up using self-control as a possible tag for things on putting time restrictions to application use, visiting websites, which websites, and more. I am open for corrections, the tag is not described yet. It also comes quite closely to some stuff under the tag parental-controls.