"Do you think that EBT* should be a free-for-all, including McDs and all junk food?" No.
"It used to have restrictions. Shouldn't there be limits, say via the 'food pyramid', for what can be bought? " Yes.
"If all the fast food places providing non nutritional 'food' have access to the EBT system, isn't that corporate welfare also?" Fast food is not necessarily non-nutritional