Luckily we’re kept totally safe by our benevolent overlords. Except for our good friend Jeff Bezos that got hacked through a WhatsApp image. Or the overt spam that any publicly posted business WhatsApp number receives.
WhatsApp replaced SMS as a free alternative with media. Sms is just a protocol. It is not necessary that a replacement is walled garden, especially not under the sole guise of spam protection - something that is being done very poorly anyway.
I can only expect the matter to be applied to large applications in some sense. Hopefully they learned a lesson or two from GDPR, and tangentially I don’t expect this roll out to happen anytime soon.