[lumb63]

Gifts definitely confer obligations on the recipient. You can experience this firsthand: take the next gift a loved one gives you, and then sell it, and let them know. Please report back on how you selling their gift impacts your relationship with that person.

People can license their code however they please, but comparing open source software to a gift is not an argument for permissive licenses.

[sneak]

I’ve done precisely this and it was fine. Gifts do not confer obligation. Anyone who thinks they do is at best insincere and at worst a jerk.