The roadmap includes support of a number of additional video providers: https://github.com/meandavejustice/min-vid/issues/6
Additionally, they're looking at supporting any old HTML5 <video> element: https://github.com/meandavejustice/min-vid/issues/331
The intent is certainly not to be exclusionary; it's just a new, experimental project with a small team.
Disclaimer: I work at Mozilla, on Test Pilot.