1. _Multiple third-party companies_ can detect these obviously malicious packages in almost-real-time
2. NPM still not only publishes them, but also keeps distributing them for anything beyond 5 minutes.
Microsoft/GitHub/NPM can only keep repeating "security is our top priority" so many times. But NPM still doesn't detect these simple attacks, and we keep having this every week.
It'll always be a cat-and-mouse game. If npm adds protections, it'll only yield false-positives and workarounds will be trivial.