This is pretty off-topic, and you're asking an infrastructure engineer who is not going to be able to answer this.

No, it is not offtopic in the slightest...especially in response to an "author". The underlying questions remain obvious. Is metaflow not used in netflix suggestions? What utility does it offer that other tooling doesnt or at least how has netflix extracted value? These are interesting questions.

I replied to someone complaining about their Netflix movie recommendations being bad. Did you think I was replying to you?