

Yeah, that’s again a little different. You have to fully trust WhatsApp that they are doing what they promise. You can’t really verify this yourself.
Besides, if the app is open source, backdoors are generally more difficult to implement. Especially for something like E2EE, where people look very closely at what the application does with keys. Same with age verification in my opinion. You’d need to pull off a lot of gymnastics to put in a backdoor, see the xz utils one which was only achieved through several obfuscated stages in a codebase rarely ever looked at by another human.

Adoption in English speaking countries only. Why is adoption equally terrible internationally if the name is to blame?
Seriously, the ONLY reason I actually know gimp has other meanings is because of discussions of the program.