Disabling a systemd service won’t prevent it from starting. For example, if another service depends on it then it will start anyway.
You have to mask the service which redirects the service files to /dev/null
so that the service effectively has zero directives.
systemctl mask --now snapd
It also means that anything which depends on snapd will likely fail. That is absolutely an improvement since we obviously don’t want anything that depends on snaps.
Yes, you’re right.
And so non-competes should indeed be banned.