either you selfhost with docker. Or you have some php webspace where you have to run an setup-nextcloud.php

In both ways it simply works. For a small instance with no special need the webinstaller is enougth. (I use it that way)

A friend told me he filled his google drive with a lot of small and random data in a cryptomator container. But he was not able to fill the google calendar and contacts with random data.

His Idea was, that after deleting there is a possibility that google only backup the last snapshot of his data and throw away the older backups. But only empty the account would not work.

Seems a legit idea, but what an effort 😮. There seem no tool that would do that for you.

👏👏👏