1. as a public company, they are afraid to lose so many accounts - see Netflix as an example on what could happen to their stock
2. bots are the future, at some point I think everyone will have a bot to post for them
Those who post quickest have a higher chance of not getting lost in the noise and that is where bots will probably be used first by individuals as well.
With that said, hopefully this not the future and new ways of moderating and presenting information will be invented, but the way things are now, it's a slug-fest and the fastest and loudest often wins.
I can see people setting up some form of pre-loaded opinion/responses based on what they want to be seen as..e.g. if $OPINION_I_DISLIKE print $YOU_BAD else print $YOURE_RIGHT! but that seems like it's pretty limited as to completely not work in practical human communication