I'll give you another set of sites which are whitelisted by browsers: github, bitbucket, gitlab, sourceforge
If you want to trick someone into running an executable, you need to put it on a whitelisted site, otherwise they will have to slog through 5 different very scary warnings before they are allowed to run it.
The funny thing: most of HN is against this kind of browser protection, I wouldn't be surprised if they disable uncommon software warnings.