Regarding tripod holes. I place my tripod with about 15 cm precision, GPS is accurate to 10 m perhaps. So I am not that concerned about folks reusing my tripod holes.
Would I be a commercial photographer, my view may be different. But I am no commercial photographer… simple as that.
It's one thing for someone to go out and try to duplicate a photo they have seen. And for a professional that is earning money from that image, especially a unique take on a well shot subject or a totally new subject, I can understand the consternation if it is another professional trying to take his sales.
But...If you allow 10 people to place their tripods in a particular set of 'holes', you are going to get 10 pretty different images. That is only 1 decision among dozens that are going to impact the results. Things like elevation of the camera, pitch, tilt, yaw, focal length (field of view), sensor size, filtration, shutter speed, ISO, aperture, lighting, etc.
As an amateur, I like other people shooting in the same location, especially if I get to see the results and compare them to my own. Figure, I might actually learn something or have my own choices affirmed.