I just sent a GDPR letter to a company in the UK, which is still part of the EU. I have one of their Android phones, and it came with a non-removable app. It appeared to just be a bookmark. One day that app woke up and sent me a notification asking me to visit a web site, which led to a SurveyMonkey form.
So I sent the company a letter asking what data they have on me. It's going to be interesting to see what happens.