Hacker: "a person who uses computers to gain unauthorized access to data."
This word is not a good connotation, and a company that's an online/mobile payment gateway buying a company with "hacker" in its name that doesn't seem to understand the definition of the word "hacker" doesn't look good.
It wouldn't matter to me what IndieHackers did, I would have passed them up just because they use a nefarious word in their name without understanding how it's used.