In open source software/projects why do people release there codes with permissive license instead of a copyleft license. I mean the original author will not get back much (if anything at all ) if he is releasing his code with permissive license (like MIT) instead of copyleft license (like GPL). At least copyleft prohibits the source codes to be used in closed source propriety software in the following way
Permissive license doesn't prohibits even this. So the author using permissive license seems to be on the losing side. Yet permissive license like MIT is the most used software license in the world for FOSS. Why is that the case? Because of altruism or something else?