This particular arms race happened in the world of WWW pornography back in the 1990s. I'll leave finding examples to you. People have been blocking stuff for

This particular arms race happened in the world of WWW pornography back in the 1990s. I'll leave finding examples to you. People have been blocking stuff for decades now, and we know what the responses to some of the initial moves will be, because the world has already gone through the dance.