The app has been available here for many months--anyone who has an EU or UK subscription can download it and use it here. Not only that, the high-end industry has logins to test out the service and use it for demos at trade shows. The best way to distribute the app for this is through the official channels (like the Google Play Store), so we don't have to open up settings to allow apps from third-party sources.
I don't see how that is a problem.

Qobuz has neither advertised nor announced an official rollout as of yet, so really, having us download it and not have a subscription to use it is on us, not them. We download it fully expecting it not to work, in other words. That isn't Qobuz's fault.
I know the feeling, as I did some development in the past. It kills me how some smartphone users complain about having to spend
a dollar to pay for an app that they like. Come on, really? Even $5 is a pittance in the grand scheme of things. I also agree that some ads in apps can be obnoxious, but for others that place an ad out of the way, people really can't complain as that advertisement is what is paying their way and putting a few pennies in the developer's pocket.
In the forums I manage, I have to pay $10-$15 to renew each add-on if I want support for it. And I don't mind paying that for quality work, and knowing that the developer will not up and abandon it a year or two from now, to fix it if it quits working after a forum software upgrade. (I just wasted several
hours trying to fix an outdated WordPress plugin that had not been updated in eight years...yet it was a central part of the site and brought it down almost entirely. That's time I can't bill for!)