Most big YouTube photography channels have video descriptions absolutely stuffed with affiliate links. They have a strong incentive to both attract viewers who

Most big YouTube photography channels have video descriptions absolutely stuffed with affiliate links. They have a strong incentive to both attract viewers who are already interested in buying gear, and to convince viewers who aren't sure they want more gear that they really do want more gear. Most people putting out high-production-value videos regularly aren't doing it for fun or to make the world a better place; they're closely watching how much money they make from it.