I'm sure this isn't made up out of thin air but I doubt any club will have to pay anything. There were too many question marks behind the league - it wasn't even finalized. They were twelve clubs instead of the necessary 20. Surely there's a clause for that, too, since nobody could be sure that Bayern, PSG and Dortmund would join the party or that they'd find 5 temporary members.
Also, where would the money go to? If a club withdraws, the fine would probably have gone to the "ESL entity" and if the withdrawal lead to the cancellation of the league, this would've been distributed among the founding members, surely? So if everybody withdraws it might even out more or less.