How is confectioner’s glaze kosher if it comes from a bug? 👀

How is confectioner's glaze kosher if it comes  from a bug? Confectioner's glaze is also known   as shellac. It comes from the lac beetle. It's  usually used on candies. It could also be called   pharmaceutical glaze when it's used on medicine.  Rav Moshe Feinstein has a tshuva about this,   he permits it. Rav Belsky, zt”l, as well, held  that one could use shellac. And the reason why   it's permitted, Rav Moshe gives different reasons  why. One reason is because even though the bug   itself is forbidden, but what comes out from the  bug, as long as it's not food, then that's not   included in the prohibition. So here what comes  out from it is something that's totally inedible.   Those familiar with shellac, it’s used for shining  floors. It's not a food additive at all. It can be   used on candy only in that it gives it a shine. It  has no taste, it has no value in terms of food. A   similar type item to this would be beeswax,  which poskim also say is permitted. Not that   people want to eat beeswax, but sometimes it can  be used as a coating on certain food. There are   other reasons given as well. Rav Moshe discusses  another reason because it doesn't really come from   the bug itself. It comes from a resin that's on a  tree, and the bug eats this resin and it converts   it into shellac, and excretes the shellac. So  it's not something that the bug itself produces,   it's a modified form of the resin from the tree.  Since it's not something that is actually produced   by the bug itself, that would be another reason  to permit it. He discusses other reasons based on   bitul, on nullification. There are those who say  it's only considered like a Chazusa, it's only   considered like a shine. There's no substance  to it that remains on the candy. All different   reasons given, and each one may not necessarily  be enough, but in combination with all these   reasons together, Rav Moshe says that it's fine  to use. Rav Belsky as well, that's the position   of the OU, and it is used, in fact, on many of the  jelly beans and bubble gums and things like that.