Political correctness/censorship wins again
The real reason Amazon (owns IMDB) is shutting down the boards it to stifle open debate. Trolls notwithstanding. The next step will be Google blocking comments and the dislike bad on movie trailers.
Soon we will only be able to view the content but not discuss it, lest a negative aspect be found and gain steam thereby hurting the already low corporate profits.
RIP open speech, it seems to be dying faster than I thought it would.