Here's a fun test: try to think of what you watched that was not suggested to you one way or another. Think of what it would even mean.
The only way you could watch movies without it being the result of a suggestion would be if you had a random list of movies (preferably of all movies ever made) and picked at random in it. I think it's safe to assume you're not doing that, so you're being suggested movies.
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.