Earlier quoted context omitted.
I dumped snapd because of the maintainers absolutely refusing to allow the users to customize the update schedule, or even disable automatic updates at all. Reading the thread with the discussion on it, seems there was real contempt towards letting the user decide not to update their packages.
https://snapcraft.io/docs/keeping-snaps-up-to-date
"After a refresh, the next refresh can be delayed by up to 60 days, after which a refresh will be performed regardless of the refresh.hold value."