Influencers don't produce anything, nor do they add intrinsic value to products they promote. Not much business to that if you ask me.
They do already compete fiercely for brands' atention so every successful influencer by definition has "stolen" potential income from others.
If you want to split hairs, influencers' work is creating an idealised image that they project to peddle products. If AI can outmatch them in that regard, I see no problem with that.
The only problem I have with that is the notion that a company gets to consolidate funds that were previously going to an actual real person. Now, if we could rely on big business to pass on those savings to their customers and employees, that would be one thing. But we can't.