I don't know if grifting is intrinsic to capitalism itself. But it certainly seems to be an emergent property of the unconstrained giant corporation massive income inequality flavor of capitalism we are experiencing.
As the number of reasonable avenues towards financial stability dwindles, people will rationally pursue whatever ones are left with greater furvor, even if those paths are morally bankrupt like being an "influencer" or "thought leader".
Like rats, we'll push whatever button gets us fed. If we want people to do more meaningful work, we need a culture and economic system that lets them provide a stable life for their family while doing it.