Yes, that is the reason you can create and use them. But I do not know how the copyright with choice works together with that. Maybe m moderator will have an answer to that specifically.
And if you are referring to the Russian guy, yes he is a … not so nice person and he tries it anyway. Haven’t checked in a while how that is working out for him.
But I digress. I think you can write in the SCP universe. You just have to check with Choices if they will publish it.
Check this : Question about copyright ( sry no idea how to insert a topic )