I maintain both commercial and open source libs. This is a non starter in both cases. It would easily double if not triple the workload.

For open source, well these are volunteer projects on my own time, you are always welcome to fork a given version and backport any fixes that land on main/master.

For commercial libs, our users are not willing to pay extra for this service, so we don't provide it. They would rather stay on an old version and update the entire code base at given intervals. Even when we do release patch versions, there is surprisingly little uptake.