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BGP filters fix this. Only accept routes from customers for IP space that they control.

I imagine Verizon has some sort of webUI with bad defaults (no filter) so that their helpdesk can setup new customers - Hanlon's razor being what it is.

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I remember setting up a T1 in the mid 90's. Our upstream was InternetMCI. There was no Web UI. There was no documentation of any sort. The guy (MCI tech) just had me read him routes over the phone and he announced them. Fun times!

easier explanation is that they were doing troubleshooting and had removed the filter to do that.

In the early days, some upstream ISPs did no filtering. You could announce anything.

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