They killed support for the first gen Chromecast and the YouTube “app” has been broken for 3+ years. They’ll just stop supporting it one day and you’ll have to buy a new one.

You haven’t been paying attention to Google in the last few years, have you?

Chromecast ultras are already broken if you try to use your own DNS.

That’s the only reason I had to replace my previous 2 steaming devices.

The streaming backend got updated and the app in my device no longer supported it. And there was no updated app made available for that device.