This isn't quite true anymore. Snap software will still automatically update even if system updates are off. You have to either edit your hosts file to block the snap domain or disable the snapd.service in a command line to prevent the automatic updates.

Good thing Linux offers choice, and if you are not okay you can just change your distro.

Mind telling us how to disable auto updating in snaps (or for a specific snap)? You've just solved a huge issue for the ubuntu community

I acknowledge that they don't make this easy, but at least there is a way to do it: by downloading a snap manually and then sideloading it from the local file, it won't ever automatically update: https://forum.snapcraft.io/t/disabling-automatic-refresh-for...

The solution is just not to use snaps. Snap is trash. Consider PPAs if you need the most recent version of a particular piece of software.

In my experience PPAs often break on upgrades

Traditionally there is some manual work to do in updating ppas to point to the new release but apparently assistance also exists for the lazy

https://askubuntu.com/questions/42895/is-there-a-tool-to-upd...

You can also set RELEASE_UPGRADER_ALLOW_THIRD_PARTY=1 before running the updater to allow third party repos to remain enabled during upgrade.