Apple selling my data?!?

Several times I've had the impression that reddit recommends posts from movies that I've only seen the day before. This may be a coincidence, but is it possible that Apple is selling my data?

I watched "Manchester by the See" yesterday via Mubi in the Safari browser on my Mac and today reddit shows me a post in r/movies about the movie. However, I have to admit that I am often on r/movies but still very strange especially because I am using reddit only with my phone. So there shouldn’t be a connection via cookies or browser cache.

Has anyone else noticed this?