question about fonts

say i were to download a font *illegally* here and i use it in a commercial project, how would they know i didn't pay for the font? like how would they know i'm using it without a commercial license.


p. i have nothing against the people that dedicate their sweat and hardwork into these fonts but the prices are crazy...80$ for a license?? and i don't even use USD currency so it's very hard for me to even purchase them :[

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hoping someone answers