Assuming that his node is misconfigured just because it spent a lot of data within 6 days is foolish at best.
Your node could easily send out terabytes of data in 1 month if you don't restrict it.
I added some color for you. Misconfiguring a node with some ridiculous maxconnections (running it wide-open) is possible, and even a nice thing to do if you have unlimited bandwidth. It's also nice to tip your waiter $500 when you go out for lunch.
Doing so is in no way a prerequisite, for running a node or eating out.
Hope this helps
