Not sure if this was rhetorical, but if not, it's because they payment wemt directly from the payer to the payee.

Using that same logic:

if you asked someone to pick up a pack of smokes at the store when they're out, they might be a money transmitter.

if you order something from uber eats, I believe they would not be the case. As I understand it, you pay uber and uber pays the business, so in each transaction is a direct payment.

As for the people who are suggesting ISPs would qualify as a money transmitter... the only logic I can think of for exempting them would be under "common carrier" rules.

I don't agree that these regulations are reasonable, just trying to explain where they're coming from. I am not your lawyer.