Yep. Another more recent example is Venmo. Since Paypal acquired them, they've been steadily removing functionality from the website to force users onto the app.
Another good example is Sonos ... they are slowly letting their desktop application die to force users onto iOS or android apps.
In the case of Sonos, it is much darker and user hostile because there is no danger of "web consumers being siphoned off by google" - you have to buy the Sonos components anyway. In this case it is all about metadata and traffic and user profiling.
I barely ever use the Sonos app on either iOS or desktop. I just use Spotify or Apple Music and route music to Sonos from there, so not sure if you are correct. With AirPlay2 I only use the app to set up new speakers. So not sure if you are correct.
e: Most likely the desktop app has seen declining usage the last decade, which is why Sonos doesn't prioritize it.
