Hello, author here.

What I ask is for iOS and Android to have the "this message was not verified" warning, as shown in the last screenshot, whenever the sender ID is displayed without any form of verification (such as, the aforementioned country-specific sender ID registries).

If browsers show "not secure" unless verified by SSL, apps should show "not verified" unless verified _somehow_.

The "how" may or may not be possible at this moment, but in any case, warn by default.

Is that naive?