Phone verification isn't designed to stop spam, it's designed to make it prohibitively expensive to scale spamming, and it seems pretty good at that. If you want to get around phone verification in a quick one-off fashion, yes it's going to be really easy. But there's no way to automate that one-off end run at scale without a lot of money and/or a lot of people. That's the whole point.

Apparently people are willing to invest a lot of money, that could be yours!