alt Hacker NewsI find it such a weird thing, maybe it's nice in some cases, but really this is a weird mechanism.
Phone numbers are exchanged a lot and repurposed. Most providers/carriers will likely have a do-not-use-for-x-amount-of-time bin to put newly reclaimed numbers in, but after a while, it will always be re-used. hence this kind of issue can happen.
In my country there's a place to register to disallow unsolicited marketing and other types of messaging. That's not by number you 'STOP' and hence it won't have such effects. A marketeer/sales company is simply not allowed by law to dial your number for sales/marketing, so they have auto-lookups to that registry to prevent breaching the law. translated, it's the 'do-not-call-me-registry' :D aptly named.
it won't stop phishing messages etc., but not much will. if you'd block it from 1 number, they will just use the next number..
The US has a 'Do Not Call' registry for unsolicited phone calls, but technically doesn't need one for texts because it's illegal to send marketing texts without prior consent in the first place. Thing is, 'consent' often just means failing to notice a checkbox during a signup flow or something, so people end up getting junk anyway.
Even more annoyingly, politicians wrote in an exception for themselves. In combination with the way campaign finance works in the US, this means that if you've ever give your number to any political campaign, it will be passed around forever and you'll have multiple politicians begging you for money for months leading up to every election. Each individual campaign/organization seems to respect 'STOP,' but once your number is on an e.g. 'Has ever donated to a Democratic candidate' list, there's seemingly no way to get it off for good. Thanks, Obama. (I gave him $50 in 2008.)