Could you elaborate? How would some limit on delegation cause people to work less? 

My theory is that if one cannot simply hand away their power to a bot, then they have to work to earn a return on their power. That work would imply curating and engaging in the platform. 

Today, you already have people doing no work and adding nothing to the platform aside from just rent-seeking. They simply delegate their power and collect an ROI with no activity whatsoever.