These few sentences, from Vox, say a lot: "The chicken industry has managed to cut all their corners, they don’t pay their environmental bills, they don’t pay for a lot of the public health hazards they cause. They have managed to produce a product that is just artificially cheap and hard to compete with....More important [than direct subsidies] are invisible forms of subsidization like not enforcing worker’s rights, exempting factory farms from animal cruelty laws, not requiring companies to engage in environmental cleanup, and not restricting practices — like antibiotic overuse — that impose costs on the whole world."
The upshot? Hopefully the meat alternative companies can achieve returns to scale and start getting their own products to be price competitive to these artifically low prices!