If there's one company that won't bend over and take it from MOL it's Exxon.
One wonders whether you actually read the story first....
Exxon were fined €315M by Italian Government in 2006 and all Ryanair are doing is using that judgement to claim compensation for actions of a cartel.
I would say given the Italian Governments ruling and the fact the Exxon have not challenged it then it is quite probably a strong case for any airline which sues.
It most likely will never see the inside of a court however as a "settlement" will be agreed subject to standard confidential clauses............I reckon FR will get €4 million.