> such a large percentage of the market is unacceptable.
Umm... expecting any kind of response from a vendor with such a large percentage of the market is... kinda arrogant.
Who are you to demand any kind of response from anyone? Big project or small? You'd probably be less offended if you had a better sense of self awareness about the nature of your relationship with Google.
Thinking that Google should kowtow to your desire to build a product is pretty foolish. You need to build a product and get some traction and then have some leverage. Widevine is evil. Google is evil.
... but so is Electron, and requiring your users to use a custom browser to use your product / feature. How about an Web Extension that coordinates playback in the browser, as opposed to a whole custom browser?