I had a chance to watch ~half of Kasparov’s class on Masterclass. For casual player (1850 lichess in blitz and bullet, 77 percentile), it was close to useless. Too high level and pretty unstructured.
And, eventually, even he gave up.
Doing really good videos for training is really hard and takes a lot of work. Fundamentally, most people good at it conclude that online isn't worth it and that meatspace pays better.
Covid has flipped that around for a bit, but I suspect it will hold true again within a couple months.
However Tom Morello’s was cool. Both technical and nerdy as well as inspirational. And I’m not a big Rage against the machine fan or anything.
(Granted there are plenty of other resources for such, including a number of Kasparov books)