Comment by matheusmoreira

We like truth. We don't like self-righteous ingratitude.

> You are owed nothing.

You owe them exactly what is written on the license file. If you do not give them what they are owed, you do not have a right to use their software.

Even if we assume they used the most permissive license imaginable, if you used their code you are still obligated to put a copy of their name and copyright notice as well as the license conditions and warranty disclaimer somewhere in your software or product. Typically you are also prohibited from using their name in the marketing materials of your derivative work.

Your "thanks for the free code loser" attitude is why I will AGPLv3 all of my current and future projects. At least the AGPLv3 is big enough to intimidate away people who don't even read licenses.