Great example of how "Bitcoin is trustless" means "Bitcoin only works is the trust is provided externally".
It's not just Goodness of heart. This case can fall under existing laws. You are not allowed to keep obvious transfer mistakes like these.
Who would enforce this? The Bitcoin police?
Right, that's "trust" being provided by the legal climate.
Yes, I refunded.
https://news.ycombinator.com/item?id=14720921