Besides getting in the way of others, though, you could make a case for charging them based on whether they make money off what they do.
People are producing impressive YouTube videos using just a smartphone or small camera. So "commercial" doesn't necessarily equate to "large and obviously intrusive."
Many parks are over-stressed and under-funded. If there's a viable income source (e.g. licenses for commercial photo/videography), why shouldn't they consider using it? Private destinations do.
And trendy online videos can bring more people into the parks, including people who maybe aren't used to treating nature gently or taking care of themselves outdoors, thus stressing the parks more and creating the need for additional services.
What you can get and do for free in public spaces is subject to change and often controversial (moooo



). I'm not saying yay or nay that people should be charged, just that you could make a case for it. (Just like you could make a case for making me pay for all the YouTube videos I now watch for free ... not all good things last forever.)