That shouldn't be downvoted. That's a great point, even if most probably misinterpret. In Asia people really don't use email as primary comms in B2C or social for many things. People use LINE, WhatsApp, WeChat and other mail providers like qq or 163.

Still it's a 'mailto:' link which might not translate to those media. But a 'tel:' link could possibly translate to "Connect with LINE" or other options.

Anyway I think this project is a very good idea. These sort of protocol links are very useful, considering on mobile you are always app switching to share something. Unfortunately, mobile browsers don't support "navigator.registerProtocolHandler" but there might be workarounds for PWAs.