@Fede Marsell,
We don't consider this survey advertising or promo; it's part of the product onboarding workflow (which is currently only enabled on a small number of servers).
There is currently no mechanism to disable the survey, but feel free to submit a feature request at https://features.plesk.com; I will also share your feedback with the team.
We have
a documentation page describing how to disable promos, but as I said, the option does not affect the survey.
Just to double-check, you mentioned using "Plesk Obsidian 18.0.68 Update 2." Is this a valid statement?