Comment 4 for bug 1837775

> Even when eg bitcoin software was entirely useless due to
> being out of date from the protocol in use, I don't believe
> we pushed updates to remove the software from user machines
> nor prevent them from installing it in the future.

We actually did authorize such an SRU, because the bitcoin client was not just useless, it was actively harming the bitcoin network. I don't recall if this was actually done, but the precedent does exist.