This whole thing is very sad. And I feel like I should clear things up a bit, since I know quite a bit from the inside.

Incsub purchased the rights to use their videos originally. The videos didn't quite meet our needs so we decided not to renew the agreement and to make our own. No infringement was made at all in creating the new and improved videos. In fact, one of the WPMU DEV team spent a lot of time shooting videos and writing scripts.

There really isn't anything else to the story here. It's a shame it's got this far.