Wait. Really? I had no idea this is true. You're saying there's a US law that means replying STOP is intercepted by verizon/T-mobile/etc. and the sender never has to see it?
This is not correct, I've worked with an app that had to handle SMS opt-out and we received the STOP message.
I don't know if it's true either. I often get confirmations from the same number that I want to stop.
If it is sent as an actual SMS, yes. Not if it goes through Apple messages or whatever.
While it's true that they must comply with the STOP message, I'm not finding any proof that it must be intercepted before reaching the business.
https://www.cullenllp.com/blog/fcc-adopts-new-tcpa-opt-out-r...