They're saying exactly what we been saying on this site.
Kendrick used those artists at the Pop Out. He could change the trajectory of any one of their careers with a single feature, especially the rappers during DJ Heds set, but he doesn't even give them a shout out when they drop a project despite them sticking their necks out for him.
03 Greedo said it best. A lot of those rappers at the Pop Out shouldve thought twice about jumping out the window for Kendrick, when Drake would've actually done some for their careers.