The weird thing about this is that the only company I've seen doing problematic user-agent handling in recent years is Google themselves. They have released several products as Chrome-only, which then turned out to work fine in every other browser if they just pretended to be Chrome through the user agent. Same with their search pages, which on mobile were very bad in every non-Chrome browser purely based on user age…
UA has a lot of limitations and is fairly easy to work around giving data to for power users. I would imagine Google didn't want to keep playing around with that.