Considering how easy it would be to filter this out, why has Google allowed it to continue spreading within their own email network? Obviously they have no con

Considering how easy it would be to filter this out, why has Google allowed it to continue spreading within their own email network? Obviously they have no control over what goes on outside of Gmail/G Suite, but inside their own network, they should be able to setup a basic filter to stop anything TO: hhhhhhh@mailinator or whatever it is. I received this email (but did not click the link) in my Gmail account from another Gmail user, so it never left the Google network. From the reports here it looks like it is still spreading even though Google disabled the app. With all of Google's machine learning expertise, how is it that this got past all of their SPAM detectors? It took me 2 seconds to hover over the link and see it was a crazy link that ended up at a domain called google.pro. Really? One of the world's largest and most advanced email systems couldn't figure that out?