> If you make that pen available to me under these conditions? Sure.
Let's leave aside whether the law (in whatever country) permits such a one-sided contract, and ask - should it permit it? There are plenty of contract terms that are illegal (i.e. not backed by law), such as usury [1] or various anti-competitive practices, because their enforcement is seen as either unfair, or a detriment to society, regardless of whether they were entered freely. Contracts are not and should not be above the law.
Let's leave aside whether the law (in whatever country) permits such a one-sided contract, and ask - should it permit it? There are plenty of contract terms that are illegal (i.e. not backed by law), such as usury [1] or various anti-competitive practices, because their enforcement is seen as either unfair, or a detriment to society, regardless of whether they were entered freely. Contracts are not and should not be above the law.
[1] https://en.wikipedia.org/wiki/Usury#Usury_law