Widevine is the defacto standard proprietary technology for DRM-locked content. It’s used by all the major streaming services like Netflix and Disney+. Without it, publishers would not make their content available to those platforms for fear of rampant piracy, especially for high quality and 4K content. I guess Widevine requires some sort of vetted relationship with any browser that wants to use their tech.

I took it to mean that newer AI browsers were taking mind-share, if not market-share. I think you’re right that they’re minuscule in terms of actual user numbers, perhaps because there are many of them now.