Man, but have you personally tried to disable it?
Did you stop apt-daily.service apt-daily.time apt-daily-upgrade.service and apt-daily.timer? Did you repeat the same but masking and disabling those services. Don't forget to repeat that for unatended-upgrades.service. Even after that whenever our CI fails an apt-get we have a pstree output to figure out what other dark pattern canonical came up with.
This whole debacle made me consider RedHat for my next install, and I use Ubuntu for almost 2 decades. It became unreliable in servers.
Dont get me started on the lack of security updates on "multiverse" packages which starts to include more and more packages and thus LTS means less and less. This is not innocent but so you buy Ubuntu One.