Netflix used to have those explicit feedback mechanisms via user star ratings, and even ran a contest to improve their recommendations based on the data[0], but it turns out "that explicit star ratings were less relevant than other signals. Users would rate documentaries with 5 stars, and silly movies with just 3 stars, but still watch silly movies more often than those high-rated documentaries."[1]

Changing from stars to thumbs increased the quantity of data (at the expense of granularity), but didn't change the relative advantage of tracking behavior over explicit ratings.

Now, your ratings may be free of these issues, but that data isn't very useful in isolation, so blame the bad data from other users for the removal of the feedback mechanism.

[0] https://www.netflixprize.com/

[1] https://variety.com/2017/digital/news/netflix-thumbs-vs-star...