This is basically an impossible burden to bear. If everyone who had anything whatsoever bad about them on the internet decided that the tiny burden of sending a letter was a worthy use of time then fighting the 1/10 which were the most dubious would ruin google financially.

This is like a network where you can cause a network to waste a GB of data by sending a KB of data.

The only reasonable response in that situation would be to invest only the money available to fight the worst of the worst requests and blanket accept almost everyone's request to silence anyone else.

If you turn it around and make a single request take a few thousand dollars worth of legal fees and many hours of work then worthless requests which are likely to be denied wont be bothered with but the most worthy may still be seen to.