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Because they were allowed to get away with it for years before La Liga steeped in. La Liga own the contracts to every footballer playing in Spain and not the clubs. Barcelona have players who have signed up who are not allowed to be part of the squad and these were free transfers. Barcelona will have to be sold at some point and don't know how that will work as they are owned by 140 000 club members and is not a public company. This is not going to end well. Every member will have to pay over 11 000 Euros each just to keep them afloat and not everyone has that sort of money as they are regular fans.