Looking at the numbers, it seems like apathy decided. Trump's numbers are equivalent to last election, but the Dems didn't show up by over ten million people.
Not really. The lack of votes seems to be in the younger “social media” generations. The lead up to polling day was very pro-Kamala and on polling day itself, sites like Reddit were a stream of “I voted Kamala” posts. Whether that was propaganda influenced or not is beside the point.
What it seems to have done is convinced a subset of Kamala voters that they didn’t need to go and stand in a 2 hour queue to vote because it was already won, which of course now we know to be very untrue.
People assume that the bot armies are only pumping out pro-Trump propaganda. However, they only need to convince the Dems not to vote.