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Basically, it's cuz of the bullshit link code system. Because the number of people in the server is so high (it including people from all over the world), the stamps don't update in time, so when a stamp pops up with a raid and you join it, it may as well have already been filled. There's also people doing exploits and shit to be bothered to join raids and they only join certain ones like Gmax Mons. The same shit happens with trades where when you're using a link code, half the time you can't find the other person and you connect with a rando because of the dumb decision to make the code 4 characters.