Each user compiling a binary is a lot of waste, have you compiled a large project like Chrome or Unreal Engine ? If you are even able to compile it successfully it takes hours on a recent i5.

A few years back at my work we were digitally sign our binaries, so I don't think non free platforms are affected at all since it is not expensive to buy a certificate , only hobby/personal projects will be affected.

Also a signed binary does not mean there are no viruses or other bad things inside, so I am wondering if we want to identify the source of the binary can we find a technical solution so you can have your website and binary with the same key then you know that binary X is from X.com people, for some reason a few years back this certificates for signing were not cheap.