How is it a smart move? Here, Microsoft is training users to ignore a security warning. If the same mechanism were added to NPM (that is, a warning that the package is suspicious and for the user to be extra sure they want it), users would have been trained to ignore any security warning issued for the compromised axios version (just like they had ignored it for all previous "clean" versions) and installed it anyway.

The relevant heuristic in NPM supply-chain compromises would be the age of the specific binary. i.e. a freshly released package is riskier than one that's been around for a few days. So perhaps the policy should be that NPM doesn't install new package versions unless they've been public for 24 hours, or there's a signed override from the package repository itself stating that the update fixes a security issue. Of course, that would also require the NPM team have a separate review process for signing urgent security fixes.

Don't make statements like this without more explanation. In what way is this happening to you specifically? What distribution and platform are you using? Did you explicitly install something to warn you about 'side-loading' executables?

EV no longer skips smartscreen either nowadays. I understand that was abused, so it's treated as the same as OV. Having a certificate allows the cert itself to accumulate trust (rather than each binary independently doing so) and provides better UX and I suspect an initial small boost to trust signal, but doesn't bypass the initial distrust. There's no way to avoid that AFAICT and even if you're an established business you hit it at intervals because all these certificates expire and so the whole process resets every few years anyway. What a mess.

Last I checked they can still quarantine your binary if it's properly signed and they decided it hasn't gained traction.