No one seems to be discussing that when a spammer learns that your number is in active use, they add it to a list and sell it to other spammers, so you get a lot more spam (particularly robo-dialing).

This is a worse problem in countries with weak anti-spam enforcement for phones (cough - USA - cough).

I’m not aware whether spammers and scammers are using these message receipts to scan across random numbers ro build their robo-dial lists, but I would be surprised if they are not doing so.

If they are not already doing it, I guarantee they’re working on getting it to work for them in an affordable and convenient-to-them way.

For that reason, I keep message receipts off on my devices.