If deep domain knowledge paid off on Youtube people like Ben Eater would be a millionaire from Youtube at this point[0], his videos are so cool and great at explaining computing. Or Clickspring, the guy who made the Antikythera Mechanism [1]. But honestly even for me being a software engineer and someone who considers himself interested in this sort of stuff, I look at these pages sometimes out of wonder but I often end up watching comedy videos and stuff like that on Youtube. The algorithm recommends it, and I watch.

[0] https://www.youtube.com/user/eaterbc [1] https://www.youtube.com/watch?v=ML4tw_UzqZE&list=PLZioPDnFPN...