Lets say you used a dating app. It explicitly told you "please do not share any personally identifiable information when chatting with any boy/girl with this dating app because your chat will be stored and processed in our server to improve the recommendation algorithm of potential dates and autocompleting your flirty talk to increase your successful rate." at the beginning of the app, but you didn't read carefully and clicked "agree". After a while, you noticed the dating app already stored all your private chat in their server for machine learning.

Although legally I believe that dating app would still be GDPR compliant,
the question is, will you continue using that dating app or not?