Another possible reason - from their EULA
> 1.6. “Game(s)”: an interactive product for a certain Platform (which might have CRYENGINE Assets embedded) in object code form including the CRYENGINE Redistributables for the sole purpose of entertainment, developed and compiled by using the CRYENGINE pursuant to its documentation. Under this Agreement the following will not be considered Games:
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>military projects;
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>gambling;
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>simulation (technical, scientific, other);
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>science;
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>architecture;
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>pornography;
>
>Serious Games.