I had exactly the same thought around Apple’s “report spam”. I have marked hundreds of text messages as spam. There is enough training data in there for even a dumb classifier to filter some of this stuff out. But next day, there are half a dozen more, nearly identical spam msgs sitting unread in the inbox.

I have also found that replying STOP = sign of life, your number is marked as “someone alive on the other end” and gets resold to 20 new lists.