some people even buy residential proxies and create accounts on communities that can steer them towards specific action like "hey lets short squeeze this company let me sell you my call option" etc.
there's no incentive to be honest, i know two founders where one cheated with fake accounts, github likes and exited. the other ultimately gave up and worked in another field.
the old saying "if you lie to those who wants to be lied to you will become wealthy" rings true.
however at the end of the day it is dishonest and money earned through deception is bad.