Some is, like Murex Purple dye (which is from now-endangered shellfish and is almost impossible to get outside of a couple of traditional greek/italian craftspeople) it is prohibitively expensive to make the exact colour using synthetic dyes in a way that is safe for human consumption so it's used in food a lot, and that has revived the fabric industry as well.
Is the blue coloring from bugs in the US? I figured that's only for countries that ban possible carcinogens and shit.
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Red was from cochineal beetles at one point but I don't know if it still is.
Some is, like Murex Purple dye (which is from now-endangered shellfish and is almost impossible to get outside of a couple of traditional greek/italian craftspeople) it is prohibitively expensive to make the exact colour using synthetic dyes in a way that is safe for human consumption so it's used in food a lot, and that has revived the fabric industry as well.