Is there some contingency for open-source softwares? Some really nice app out there are release by a single dev that does this as a hobby, and imposing a fee on

Is there some contingency for open-source softwares? Some really nice app out there are release by a single dev that does this as a hobby, and imposing a fee on them to release a software they make simply out of passion may make them leave the platform if that is the case.