People literally steal each other's food out of office fridges every day. These are colleagues that know each other on a first name basis. Human decency is an acquired taste and it doesn't reach as far as people assume.
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The author of curl chose to give it away under an open source license. Yes it would be nice if more corporations with deep pockets that use it would donate money and resources, but there’s no legal or ethical obligation for them to do so.
If you want people to pay for your software license it accordingly.