Do you remember the people pasting a paragraph saying things like "I do not consent to be tracked and my informations to be sold"? It was met with snark by a lot but I really wonder if it would not be legally valid in several countries.
It's like leaving an email in your drafts folder expecting google to read it. Or typing something into Google Search box and expecting that to be legal communication.
More info: https://www.youtube.com/watch?v=xDHDM7PfyYs
The above video makes good points even though it's been posted by college humor (not particularly meant to get your legal advice from)