we have sunk brush on a body of water that is public but is not a local hole. there are probably a dozen or so guys who fish it. we purposefully drill spots out that have no brush to play games. but in the end, you can only hide the spots for so long.
So I'm not the only person who does this...
But yes, someone will always find the brush.
Just yesterday I drove to one of the public ponds I fish in the IC area, only to find a tent set up either right on top of a brush pile, or very close to it. I just turned around and went to another public pond nearby. No one was on it, so I drilled some holes, waited for sunset, and caught a few nice bluegills.