I'm a broadcast chief engineer for a FM radio station KEPC in Colorado. My broadcast stream gives me numbers on if the device is a PC, Apple, Android, Alexa, Chromecast or other. I can tell you that the numbers for chromecast vs Alexa are small for Chromecast. What does that mean for the future of Chromecast? I don't know, I'm just telling what I see and PC is still king of the hill with both type of phones added together pulling higher numbers than PC. Myself I use Airplay but may use a server in the future.
OK now I have to plug the station as we have 7000+ song play list so if your tired of the some old stuff check us out. Non profit college radio. Sorry I had to do it, I'm so ashamed no I'm not