What, exactly, do you get out of doing something like that? As an intellectual exercise I understand probing to see what exactly is accessible on a “blocked” connection, but intentionally wasting bandwidth seems the virtual equivalent of leaving the taps running in a public restroom to waste water, or perhaps clogging the toilet and overflowing it.
It reminds me of working on campus IT, and the sort of person who, at the end of the semester realize there are pages remaining in their "free print" allotment, print out every page completely covered in black ink to waste as much as possible.
I worked at a company that would provide "free pizza" during evenings to encourage people to stay a little later and get more work done. It wasn't long before people would simply grab armfuls of food, entire pizza boxes, and bring them to their cars, ending that little perk quickly.
I have also printed a blank document before to get blank paper, instead of dealing with accessing the paper tray, which may not have been feasible given the circumstances.
No one else would, especially not the company or the customers who paid for the service expecting to receive it. They'd see it as vandalism, and they'd be correct.
"The boat operator is charging too much for internet access, so let's ruin internet access for the customers who they've already received payment from! That'll show 'em!"
I ran a public anarchy Minecraft server in high school using a copy of a private server's map that got reimaged each week. Periodically someone would join, spend all day destroying buildings, then explain via a series of messages to nobody that he's only doing this to teach the admin a lesson about anti-grief plugins.
