The Google Play version of AntennaPod has Cast enable, FDroid version didn’t the last time I checked.

Didn’t realise they sent data to YT/Google. Am now more interested in any answers you get 👍

Not all piped based, but you can use beatbump.io on desktop. Innertune or ViMusic on Android (both available on FDroid). I prefer InnerTune as you have more control over offline tracks.

I got “unique among the 185,973 tested in the past 45 days”

Edit: this is using Firefox Android Nightly with UBlock + Canvas Blocker