> You're saying that because users didn't pay for the software, they're not allowed to be surprised and angry when they're forced to either continue using unmaintained versions, take over maintenance themselves or wait until someone from the community does

Surprised maybe depending on how long the software has existed, but angry? 100% they are not allowed to be angry.

Anyone who thinks that a maintainer of open source software is required to maintain that software for free forever is an entitled brat.