I haven't seen any flakes growing yet?! But cereal grains, oat kernels, corn kernels, etc... they do. Therefore, one will be able to buy the ingredients unprocessed and turn them into flakes through the crusher....

Or e.g.: Take oats, run them through the flaker and you get fresh oat flakes ;-)
Of course you can also just buy oat flakes in the shop :-)

Yes, they can, but kellogs frosties, for example, are such "crushed" corn kernels that have been soaked.
I think this product is more about creating something that you know from the supermarket but has the flavour you want.