Being open-source

Yeah, that. That's exactly the problem. To quote @Puzzle_Sluts_4Ever above, who put it much better than I could:

. . . the main issues boil down to concerns over some parts of the Snap ecosystem being closed source, Canonical’s ongoing efforts to try to get some of the Red Hat “premium linux” money, and arguments that other solutions (e.g. flatpaks and appimages) are “just as good, if not better”. And it doesn’t help that Canonical/Ubuntu is increasingly pushing snap as “the only solution” for some applications.

When you speak of no single One True Way and things being completely open source, Canonical/Ubuntu have already left the chat.

There should be one way for sandboxed shit, since the alternative of package managers already exists

We don't need snap, app image, flatpak all to compete. We need shit that just works

Gotta be honest, as a dev I tried to make a Flatpack of my app and gave up. Making a snap was much easier. Of course, I also offer it as a .deb, .rpm, Pacman package, etc. too