This is the way it works in Australia. I wasn't a huge fan of having to prove who I am and have my identity related to be able to txt and make phone calls or use mobile internet when I moved here.
In theory, it's also how it works in the US, but most store clerks don't pay attention to the regulations and let customers buy pre-paid SIMs with cash. There really isn't any punishment for it, which may explain the rule change.