This actually looks pretty neat, particularly the integration with Flatpak. One thing that confused me when I first went to Linux a million years ago was the difference in how you install stuff. With Windows you download an exe file, double click it, next next next finish, and you have your app installed. With Linux, every distro is slightly different and it's almost never quite as straightforward to people. I think…
Flatpak is great for people who wish they were running Microsoft. Others can just run a distro for people who believe in open source software.
What about Flatpak is contrary to open source software as you seem imply? Flatpak itself is free software, so is most of the software packaged with it. There are quite a few good reasons to use Flatpak, especially for developers who want to make their software available on different distributions without wanting to worry about packaging separately themselves. There are valid criticisms of it, but being somehow against open source software or being somehow related to Microsoft is not one of them.