You wouldn’t pay a human to write 100k LOC. Or at least you shouldn’t. You’d pay a human to write a working useful compiler that isn’t riddled with copyright issues.
If you didn’t care about copying code, usefulness, or correctness you could probably get a human to whip you up a C compiler for a lot less than $20k.
Are you trolling me? Companies (made of humans) write 100,000 LOC all the time.
And it's really expensive, despite your suspicions.