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‘Has flat buttocks,’ ‘cusses when scared’: Amazon keeps shockingly specific customer profiles
(www.fastcompany.com)
This is a most excellent place for technology news and articles.
I don't think is that. They have the data about you and me too, it's just not shown like that (yet, at least).
Making those assumptions based on what you've bought from them is perfectly legal under the gdpr. Maybe you have to check a personalized ads option, or leave it marked, but I think that as long as you tell them in your privacy policy when they agree with it that your using their data for it you're good.