It is not freeloading, but correspondingly you cannot demand anything from a gifter. Not even "could you please look at it". They might. Or they may ignore you. Or they may delete their repo and go away to the wild. Up to them.

Yet in real life gifting, we expect reciprocity and have norms. (E.g., if little Johnny doesn't bring a present to Sally's birthday party, he never gets invited back.)

Asymmetrical gifting is only acceptable with a power imbalance; if the boss gives an employee a gift, it need not be reciprocated.

FOSS actually turns this on its head, since unpaid volunteers are giving billionaires like Bezos gifts. Worse, people argue in favor of it.

I've never once expected someone to repair a gift they gave me because I found a flaw in it. That's when it becomes freeloading.