we need to define what "suggseted to you" means. if you are browsing a list called "Films we think you might like", that's obviously a suggestion. however, if you're browsing a list of "Action & Adventure", you need to know how the titles in that list were added. is it recent titles in that genre, is it titles that are currently trending, or is it titles that have the same actor/director/plots as other titles you have been watching?
the only way to really know that it wasn't some sort of algorithmic detection is if you 100% absolutely positively never browse and only watch a movie directly from the search feature.