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try running snap inside a docker container and see the gateway to hell it opens

Huh? Docker has limited amount of layers, and can easily consume a lot of disk space. It's also very easy to mess up data between layers.

Better would be to run Snap inside LXC containers, it works well: https://github.com/wekan/wekan-snap/wiki/Many-Snaps-on-LXC

My point is: you can easily install software in Docker using apt-get

You cannot easily install software in Docker using snaps.

This makes snaps less useful on servers than traditional apt-get.

Snap with one package works on many distros.

For TSC platform game https://secretchronicles.org/en/ , how can I get all .deb packages I made to official repos?

For those .deb packages, I had to compile for CPU architecture and distro separately, because of all the different versions of dependencies.