I'm not sure if I'd call this "ripping off". It is broken english, but in the US you are allowed to say "X compatible replacement part" and not be infringing:

https://aaronhall.com/online-retailer-may-use-manufacturers-...

This listing doesn't exactly pass all of the tests, but as a buyer I'm currently not confused.

The listing says it's compatible with Pololu pinout. That has become a common term in stepper motor control.

It's little more than a standard IC on a simple board with a standard pinout.