Banned on Designs and Find New Tunes

Ok,so today i found this,i’ve get banned from new tunes and design,all i did was a skin for a DMC with the text [Mod Edit - D] for this i got banned?Really?No warn,nothing?
I never played online on forza,just singleplayer.
Now the question is,WHY ON FIND NEW TUNES?
Give me the reason,on design i understand but WHY on New Tunes

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