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Yeah, they were clearly plagiarizing. You should’ve told them to go pound sand

I would have sent them a contract to buy the code for $15k.

This is the correct answer, assuming you didn’t sign anything that gave them the rights to what you produced.

This is the way.

Plagiarizing aka Parent Comment just made an Open Source "library". What's wrong with using those??

If a solution to a problem is available on github it would make sense to use it if it solves the problem.