alt Hacker NewsThat is ridiculous. If you buy a sandwich for a homeless person, you do not need to warn them that you won't give them another one tomorrow. If you think generosity is an obligation of slavery, you have your morals backwards.
However, almost every open source license actually DOES warn that support may end. See the warranty clause.
If you give them a free sandwich every day for 500 days.....yeah, you should probably tell them you're not coming tomorrow.