Voting has now closed and the majority (61.1%) of voters feel that non-premium users should be able to join custom cup at
some additional cost.
I had hoped a Europa League-style custom cup could be organized for clubs who failed to pass WCL group stage, but alas only 7 out of the 48 clubs who will not pass to knockout rounds are premium users...not even enough to form an 8-team cup
Personally, I really hope developers either allow nonpremium users join custom cups OR a secondary Europa League-style competition feature can be developed...and soon