Even when it comes to TV, Apple realized they had to create an Apple TV+ app for other platforms to extend the reach of their investment in shows/movies beyond their own hardware.
But the support from Google is abysmal. No search functionality, developer hostility when trying to publish something etc.
So, if you're making an app that benefits from a big screen and your customers are willing to buy a cheap dedicated device to easily use your app on a big screen, supporting apple tv might be a very sensible choice.
Compared to other HDMI-connected devices (e.g. Google Streamer fka ChromeCast, Amazon FireTV, Roku) or major TV platforms like Android TV or Samsung and LG, the market share that Apple TV commands is dwarfed. Apple TV devices are also very expensive.
A startup like Zwift that bets on Apple TV as a key GTM strategy is making an error in judgment. Apple TV is extreme long tail footprint.
Order(s) of magnitude less niche than Apple Vision.
Apple TV is just a tale of so many missed opportunities.