True. So if you want the built-in Tidal streaming you have to stick with what they support in the app, I guess. Airplay is possible with Volumio and ROPIEEXL I think, but you are on android. Google is keeping Chromecast proprietary despite discontinuing the audio. So you have to go used, or use a Chromecast HDMI Dongle as an audio player. An HDMI splitter is only $20 or so.
I'm casting Tidal to CCA/Topping D50 to great effect. However, I'm always looking for a reasonably priced all-in-one solution, mostly to reduce the number of components and cables.