Because the simple fact that you are there with a camera, are supplying the people with photography, and you are even insinuating that you are doing a better job is the reason.
In fact some pros do upload to social media, but they also want to make money off their work and not spread it around for free.
As I said before, in what other profession are amateurs allowed to be present, and offering their services while the pro is working.
I've had people try to bring along a friend with a camera, to outdoor family portraits I was doing. Naturally, I made them stand far away when I was working. But as I was leaving, I saw them do my setups with their friend, so that they could use those pictures for other things. Those other things are what can cut into my profits.

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