Where are all the ads in Windows? I have Windows on most my computers and Ubuntu on one. The only place I see ads are in Ubuntu when connecting through ssh. Right now there are ads for MicroK8s and Canonical Livepatch.
https://github.com/bmrf/tron/tree/master/resources/stage_2_d...
I run the Tron project, it's open-source and these scripts are updated frequently based on community input.
In Germany I have only ever seen OneDrive popups in Win10, which can be considered either a "suggestion" or an "advertisement".
"Try the new cross-platform PowerShell https://aka.ms/pscore6"
There were a few pre-installed apps but that's completely normal to be honest. If you go in a shop and buy a PC then it's usually full of that shit. If you remove it, it doesn't come back. They're not really ads but things the average user will want (I want office!!!)