Verio Decides what parts of the internet to drop

Can you give a concrete example?

In most of the cases I've seen the people wanting to break up an class-B
network either because 1) they don't want to return the class-b network to
ARIN and get two or more appropriately sized blocks, or 2) their upstream
provider won't aggregate announcements from multiple connections, 3) they
made a mistake and announced their IGRP subnets via BGP.