R&D is a sunk cost that is largely paid by their iGPUs. Selling at cost is not a subsidy and that is not relevant here since they should be making money off every sale. I tried estimating their costs a few months ago and found that they had room for up to a 10% margin on these, even after giving retailers a 10% margin. If they are not making money from these, it would be their fault for not building enough to leverage economics of scale.