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However, I have not noticed any (excessive) advertising on the Chromebooks, no.
It was very different with a Windows 11 computer that I recently had to repair. These adverts come across very obtrusively as "tips" or "suggested apps" and tempt inexperienced users to click ... and to buy:
Source...
Win 11 is probably Microsoft's worse release. The amount of tracking that they've put in is insane.
Go through the privacy settings and turn some of these ads off.
Install a third party firewall to prompt you when any program wants to create an outgoing connection, and block
all this spyware they've put in. It will take a day or two to block all of them. You would be surprised how many of these
send data silently. Wireshark can tell you exactly what data they collect and to which websites they send it.
There are tools that go through the registry to clean this shit up, if you bothered by it.
But in my experience, Microsoft's spyware programs do not consume a lot of resources once they lose network connectivity.