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Probably video production is one of the most widespread contexts, but it's really with any type of culture, production or pursuit. When learning and understanding are prerequisites, it keeps the rabble out and quality high, and often keeps out non-whites as a bonus. Lefties also have trouble with barriers, due to the same lack of cognitive function that makes them lefties.

There was a time when anyone producing video necessarily had to be studious and perseverant, and it resulted in said producer also having the mental capacity for cinematography and learning established methods for making a good video.

Then there's how to host it online. This should require a tech guy to set up a server, and we obviously aren't better off in total now that various large platforms automate the online publishing process.

Want the server software not to suck? Well maybe don't create shit like Python, thus handing the peasants and commies a key to the programming gate. There are two reasons that C++ is pedantic about stuff such as the difference between pointers and references - one is that they form the fabric of optimal compiler output, and the other is that it keeps the unintelligent out.

Mathematics is in a better place at least, in being quite a bit more fundamentally protected against peasants understanding its language, but remember it used to be gate-kept by teaching it in Latin for no other reason than to exclude undesirables with whom greats such as Isaac Newton refused to associate. This goes far back, such as the Pythagorean school being strict about not giving its knowledge away to commoners.

There was also a time when society didn't teach any old rabble how to write. Honestly, a student should be required to create one's own pen before receiving that education, if only to keep that privilege within the subset of people who bear the noble genes of creativity.