[mathattack]

You may be overrating what they do. I suspect that 90% of the recommendation weight is based on what other people clicked after watching the same video.

[sidlls]

I've seen so many really complex real-time recommendation pipelines that could be replaced by a simple weighted click-rate style algorithm.

The application of ML and data science in this industry is quite hilariously bad, really.

[mathattack]

Somehow so much leads to correlation. :-)