Most of the apps I use directly support casting to their respective ATV apps.
YouTube 100% works with any device, but I don’t have a daily driver Android so can’t confirm other apps.
TBH most apps exist natively on the Apple TV so “casting” something to it is a non-issue. It’s more of a Chromecast thing to use your phone as the source, leaving the relatively underpowered Chromecast puck just for pure video streaming.
Apple TV on the other hand is massively overpowered for most stuff people use it for.




And what did your tcpdump reveal?
LG levels of bullshittery? Or Sony style fingerprinting of anything on the screen?