Hahahahaha - sorry, the mere suggestion that Google cares enough about this to "penalize" anyone who ignores this system is actually really funny to me. No, of course they don't do any such thing. The system is entirely and completely optional, and developers have long ago realized that actually using it is to their own detriment, because users will just block the marketing notifications but leave the important ones, so they just bundle everything together. I have actually messaged several developers of some of the apps I use if they can fix this exact thing and the response has always been "sorry we don't have the technical ability to do this" which is obviously complete nonsense. But no, there isn't any penalty for not doing this from google.