They do little oversight of package safety/maintenance. A hidden cryptocurrency miner was slipped thru in uploads. Major apps lacked updates for a long time. Server components of the snap packaging system remain closed which gives Canonical control over the tech. Avoiding the support and proliferation of their lock-in format is a good move IMO.
Also Ubuntu anything has the tendency to be half baked abandonware once Canonical grows bored with it after they fail to monetize it.