Well Cisco is certainly being proactive about it
If, however, they're only sending emails to existing customers, then there are a number of potential new customers that might get caught.
Except, of course, for the fact that the bug is rather hard to encounter since the buggy software is not compatible with Hyperflex in the first place, so I'd guess it's a bit difficult to encounter it.
Feels a bit like a case of headless chicken.
We need a chicken icon.