It's difficult to talk about a good or better algorithm without quantifying what that means. Youtube aren't trying to build a good algorithm. They're optimizing

It's difficult to talk about a good or better algorithm without quantifying what that means. Youtube aren't trying to build a good algorithm. They're optimizing for a metric like time spent on the website. If your algorithm could beat their current solution in an A/B test, I'm sure that they would be up for it.