Love u kitty
@Quickseller & co: While I respect Kant's views on many things, his view on morality is very wrong. It can and will cause much more evil which could be easily avoided (e.g. "thou shall not kill" applied in driverless cars would lead to letting your car run over 10 people instead of say 1). Not to say that there aren't situations where you should not harm someone/something in any way just because it may cause greater good/lesser evil. Labelling the whole subset of a certain type of actions as equally bad and always wrong is also incorrect. Say stealing to enrich yourself vs. stealing food to keep your children alive (assuming there is no other way). In say the later, the moral choice is stealing. Saying nonsense such as "stealing is always wrong" implies that morality is objective, which is a load of bullshit. Morality is solely a subjective concept that we invented. Anyhow, moving on.
@HCP & co: The law system pretty much everywhere at the moment is very corrupt (due to legality of lobbying and whatnot), and laws regarding stuff like theft are just nonsensical ('create a no-theft backdoor which can only be used by a small set of entities'). This is why I explicitly wrote ethical dilemma, as discussing legality is a waste of time; this is whilst ignoring many factors e.g. this is crypto, criminals are not going to sue you etc.
As usual, the situation's complexity makes it impossible to make a satisfiable and quick decision. I'm just going to list a few factors that played a role without discussing them:
1) It is impossible to know whether the payment comes from a previous scam or not.
2) It is impossible to know whether the contact is a proxy, part of the team or a 3rd party (anything they say at this point can be considered dishonest).
3) Luckily, nobody got harmed from this incident (so far).
With all that being said, a decision has been made: The refund is going to be partial. The amount proposed was agreed to by the project. The user has also explicitly stated several times that they are no longer responsible for whatever happens on the forum regarding this (e.g. scam accusations, negative ratings, etc.). I'm locking this thread now, as it has reached some consensus. A full disclosure on who the parties are, who found important information and when this happened will be revealed soon (probably in the form of a scam accusation due to the fake team).
I thank everyone for their valuable input on this matter, regardless of whether I disagree with what you said or not.