We give prominent warnings, when for example a certificate is out of date.
We should protect users visiting scam websites, and companies with very poor customer service records - I'm talking those that don't have a phone number, don't answer emails etc.
We can collate already existing resources and also allow user feedback (yes it is, no it isn't).
By doing this we would a) hurt scammers b) discourage companies from having 'ghost' customer services c) protect consumers d) create a safer internet e) encourage other browsers to implement similar features