I don’t agree that it made any sense to do that. If they wanted to containerize apps, there has been an open source solution to that for years; Flatpak.
ain’t nobody got time for that
As an app maintainer, that wants to support Ubuntu, why would I prefer to deploy a snap server, instead of publishing deb files, or creating a Flatpak?
It’s Cannonical. They prefer implementing everything themselves fast, rather than developing a more sustainable project with the rest of the community over a longer timescale. It makes sense that when they do that, there will be very little buy-in from the wider community. Much like Unity and Mir.
As you say - why would others put time into the less supported system? Better alternatives exist. If Canonical want their own software ecosystem, they’ll have to maintain it themselves. Which, based on Mir and Ubuntu Touch, they don’t have a good track record of.