People's expectations are not constrained by the license. They are free to exercise a sense of entitlement beyond the terms of the contract and empirically they often do. The license does not prohibit them from engaging with the authors or maintainers for any reason whatsoever, including requesting free labor.
You could perhaps add a clause in the license that restricts this behavior but then it would no longer be FOSS.
They are free to have a sense of entitlement or to try and engage with the project maintainers/owners but there is nothing that obligates them to reciprocate anything at all.
