Non-standard interpretations of a theory of logic are relatively common, especially in fields such as philosophy and mathematics, where different philosophical assumptions and perspectives can lead to different interpretations of the same theory. For example, in the case of first-order logic, there are different interpretations of the quantifiers, such as the standard interpretation where the quantifiers range over all individuals, and non-standard interpretations where the quantifiers are restricted to some subset of individuals.

Non-standard interpretations of a theory of logic can be useful in several ways. First, they can help clarify the meaning and scope of the theory by highlighting its assumptions and limitations. Different interpretations can reveal the implicit assumptions and biases that underlie a theory, which can be useful for identifying areas where the theory needs to be refined or extended.

Second, non-standard interpretations can facilitate the development of new applications and fields of research. By adopting a non-standard interpretation, it may be possible to apply a theory of logic to a new domain or problem that was previously considered outside the scope of the theory.

Finally, non-standard interpretations can foster intellectual curiosity and creativity by encouraging scholars to explore different perspectives and assumptions. By exploring different interpretations, scholars can gain a deeper understanding of the theory and its implications, and develop new insights and ideas that can contribute to the advancement of knowledge.

That being said, it is important to note that non-standard interpretations of a theory must be consistent with the theory's axioms and rules of inference, and must be carefully studied to ensure that they do not introduce any contradictions or inconsistencies. Moreover, non-standard interpretations should not be used to reject or ignore the standard interpretation of a theory without a compelling reason.