YouTube is reportedly slowing down videos for Firefox users (Update: Statement)
(www.androidauthority.com)
Youtube is funded by one of the most profitable companies in the world. I understand the desire for Youtube itself to be profitable, but it could just as easily be a loss leader into Google's services and ecosystem.
Video creators on the platform also rely on a share of ad revenue to make a living.
Ad revenue paid to content creators is notoriously low. There's a reason that content creators these days are all sponsored.