The system to display a brand logo next to your email (e.g in Gmail) is based on https://en.wikipedia.org/wiki/Brand_Indicators_for_Message_I... Basically a company needs to purchase a certificate for 1000-2000 USD/year. Scammer don't do that. (Also me as a small non-ecommerce company doesn't do that). It's not ideal but some trust can be established by making it expensive.
i agree it's a step in the right direction. App publisher profiles in App stores (e.g. Apple App Store, Google Play, MS/Xbox) are similar initiatives that help establish publisher / provider trust. Great example!
