It’s no surprise YouTube opted not to censor this genre based on their workplace shooting incident. Companies are getting more and more paranoid these days.
EDIT: Spoke too soon. It’s already gone.
What’s next? Lockpicking?
What would you suggest as an alternative?
Social media sites which depend on user supplied content use that content to advertise the platform. Maybe no one told Youtube content creators that they were really doing sales work for Google, but that's always been the nature of the modern social media model. They don't work for you, you work for them.
with "actually improves personal security/safety" I do not agree. If you are not training daily watching video about martial arts does nothing to improve your personal safety. Though there is guy having gym in China who is explaining it better than me and he has martial arts channel. But that is one guy vs tons of "self defence bullshit".