probably because he only wants the $$$. there was a report a few days ago saying something along the lines of 'De Ligt trusts Raiola'
Well, when you hire Raiola, you want the best contract possible.
I don't blame the guy. de Jong did the same and milked it as much as possible. Only chose Barcelona when they upped their offer big time and even promised him guaranteed playing time by selling players.
In fact, de Ligt is a very good professional footballer by the look of it. He gives his heart out when he plays for the club he is contracted to. He puts out good performances so that he is wanted by all the big clubs. He is right imo about seeking the best deal possible for himself.
I mean he is not a Barça academy player so he is, by essence, a
mercenary. He will squeeze out as much money as possible and will try to get guaranteed times like de Jong and will sign for Barça. It is up to the club to give him reassurance the same way they did with de Jong.