Are you positive that "tell nobody" is the mitigation strategy that Google used here? They could have easily asked router vendors to patch their devices, asked ISPs to blackhole those customers until they're patched, etc.
The hard part (and it truly is hard!) is convincing a few companies to do this. It risks user complaints in the short term, to solve a problem that may not be very acute for the largest companies (who can simply absorb these attacks).
(No I don’t expect any response but I am just leaving this thought for those who stumble on this thread in the future).
ISPs do this literally all the time. They sell services that do this.