It‘s worth noting that this has been going on for quite a while now in Europe. Two of Germany‘s largest retailers, Edeka and Rewe, don‘t stock products from quite a few companies like Mars, PepsiCo and Procter&Gamble anymore. Edeka even went to court with Coca-Cola because of their ludicrous price increases in 2022.
And both retailers haven’t shied away from making these issues very public. They‘ve often put signs into the empty shelves explaining the situation in detail.
They are obviously more afraid of having to explain those massive price hikes to customers, than they are of not stocking these products at all. Which, seeing how little the manufacturing costs actually increased while profits for the manufacturers surged, is definitely a good thing for consumers.
Flatpacks are very restrictive by design. While this is a good thing in many cases, it makes it very difficult for tools like EmuDeck to work properly. For example, automatically installing other applications (in this case: emulators) isn‘t easily possible. This would make a flatpak version of Emudeck pretty much useless.
While I understand your concerns, I think installing an AppImage which has been built on Github from open source code just isn‘t all that risky.