memes

Billionaires successfully dissolved the left into factions of people who all in-fight

I think this goes all the way back. Leftist groups have been competing basically as long as there's been a right and left. Going back to the OG "Left," the French Revolutionaries, you see the Jacobins seize power from the monarchists, after which they start to eliminate competing revolutionary groups who have some ideological differences. In Russia, you've got the Mensheviks being eliminated by the Bolsheviks, and then the Trotskyists being eliminated by the Stalinists.

Wherever there is a small difference in ideology and people willing to die for it, the left will always be at each other's throats.

On the other hand, I think the right keeps succeeding precisely because of identity politics: they unify under an identity instead of an ideology, or I guess maybe more specifically they succeed at turning identity into ideology. Identity politics are pushed by the right as a way of forming out-groups so that the majority can remain unified and always have a "them" to distract from what the ruling "us" is doing.