right, but any email supplier can use this API, and will no doubt re-write their terms & conditions so that they can (and their business model involves selling user data already)
this is solving a problem that doesn't exist, and potentially undoing any privacy benefits of Lightning to boot. You can bet the most glitzily advertised, simple, colorful implementation will be surreptitiously funded by some hedge fund, bank and/or government spies.
invoices as QR codes or URI's are just as easy, and it's much easier to retain privacy while using them