Is Kamala that unpopular that you have to pay people to vote. This is Hilary all over again. And yes I know it's response to Musk but this wouldn't have been necessary with Obama.
A lot of people are lazy and just assuming Trump will lose, won't vote. Others it's a challenge because they have to take time off work as voting day is not a holiday in the US. Additionally some polling locations have long lines, something notoriously common in low-income areas. People have been known to wait many hours just to vote and so not surprisingly these areas often have lower turnout due to frustration.