haaaaa? THE paranoiia8? Then we worked on the S.T.A.L.K.E.R. series modding time ago 
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Fun times.
Those companies can act to protect their own brand, but FAB agreement is that you can only use content / names / branding etc from other parties with permission from them. The way I see it, even if one of your products is reported for violating terms (even by FAB), the seller should have to be contacted first, not removed. Apparently they go straight ahead to remove the listing? I can find tons of products out there that are not removed in equal way (sly raccoon, dbz, blizzard etc) so they definitely don’t really dive into details (do they act on random? or do they act on reports and don’t look at all?)
FAB should definitely contact you to make clear WHY it happened. All the games using those names in the end product don’t get taken down. They must make clear if it violates their terms and why (copyright, trademark, maybe violence? the design of the models (copyright again) etc.)
Also FAB staff doesn’t really check out the forums, you should probably send them an email. They have a contact form for sellers when logged in on FAB. I’m also on FAB these days. It’s far from flawless…