Was this 3rd party code that you bought or stuff you found on github? In the latter case, basically, you're saying that you didn't know and didn't care about compliance because no one could have found out?

That's a rather uncharitable interpretation.

I think it's more likely that they don't know if they're licensed to publish the code in question.

- Libraries included even before my arrival.

- Libraries licensed for usage but not for open sourcing unless X, Y and Z.

Etc.