As far as I can tell, this is what happens any time a new restriction is introduced without specifying who must bear the financial burden.
Checking for allergens has a cost! Who is supposed to pay?
If you want the general public to pay for it, then mandate that every bakery certifies the amount of allergen in their bread: all the bread will cost more and the allergic people will be able to choose safely.
Otherwise, what else would you expect? Bakeries run their calculations and saw that certified sesame-free bread would cost too much for their customer base to keep buying from them, and opening a separate production line is not warranted by the predicted demand. What else could they do to stay in business?
Checking for allergens has a cost! Who is supposed to pay?
If you want the general public to pay for it, then mandate that every bakery certifies the amount of allergen in their bread: all the bread will cost more and the allergic people will be able to choose safely.
Otherwise, what else would you expect? Bakeries run their calculations and saw that certified sesame-free bread would cost too much for their customer base to keep buying from them, and opening a separate production line is not warranted by the predicted demand. What else could they do to stay in business?