It doesn't matter how far to the left you go. It doesn't matter how much marxist bullshit they spout and socialist gibs they promise.
It's never enough becuase they're always, ALWAYS, "Center-right." Kamala? Bernie Sanders? Hell, Karl Marx? They were all "center right" compared to "real leftists" like in some mythical nonexistent communist utopia in Europe / Canada.
It's a tactic to force the base to constantly push further to the left, no matter what they're given, to "never be complacent," et cetera. But if you combine this with the left's pathological inability to define what it means to go "too far left" you get shit like people nodding and accepting "Kill the [White Farmer]" chants as just catchy songs that mean nothing or letting half naked erotic dancers do "child drag shows" to 6 year olds in front of their cheering pedophile enabling parents.