But it also requires you to have some way to actually validate that the signature is valid. Apple provides this service to registered Apple developers, so you c

But it also requires you to have some way to actually validate that the signature is valid. Apple provides this service to registered Apple developers, so you can code-sign your independently-distributed app or installer and the certificate you sign with is generated and signed by Apple. But in nearly all cases of code signing I've seen outside the Apple developer ecosystem, it's GPG signatures, which relies on you being able to independently verify that the signing key is valid and belongs to the vendor and was not compromised. Which is to say, not very many people who download stuff outside of a package system are actually going to validate that sort of thing.