Just found this short mention of Paranoimia in Scene Press #01 (C-64 diskmag):
“The Amiga group Paranoimia has trouble with Rainbow Arts. Reason is: at the Radwar V4 Paranoimia already had the original of X-Out. Then they asked the company what they would give them if they don’t release it – R.A. just said ‘Fuck off!’. In revenge Paranoimia released X-Out 3 weeks before the company could and that’s what they wrote in their scrollers, too.
‘Faster than the company themself!’.
Result is that Rainbow Arts is hunting for the guys who are guilty that Paranoimia got it so early…”