Just a hunch... he's going to let the results finalize. Trump will win by about 1% or 1.5%... but then reveal the actual results with all bot votes removed... and it's going to be a complete landslide for Trump.
I feel like this entire pool is a ploy to open the eyes of people.
This is something I can see him doing. Letting the poll end, with everyone thinking that Trump was barely let back on, and then all of the bot accounts that outed themselves get called out and removed. This will show the rest of Twatter that YES, voter fraud is a real issue and not a conspiracy theory.