Bazzite ships Flathub unfiltered.

Last update (which replaced Discover with Bazaar) changed that.

so no taking a precompiled binary and shipping that.

All FLOSS apps on Flathub are built on trusted platforms by default, in the open and verifiable. Same thing with Brew.

Not including proprietary software in the default config is a valid choice every distro has to make.

The sudden success of Bazzite comes from how easy it is to use.