Mino Raiola has his track record speaking for himself.
He is hated. Everyone is saying he is a greedy bastard. But one thing is for sure, he is getting his players big deals and contracts. Look at Donnaruma at Milan AC. Paul Pogba at Man United.
He is so good that his clients have complete faith in him and clubs are forced to give him those fat checks if they want those players. He even manages to place some random guys in "ghost transfers" in big clubs so that they are able to get the lead for his star clients.
He is maybe despicable for everyone in the football, be it the clubs, the UEFA, the FIFA, but he is truly well loved by his players. And if de Ligt, specifically, went to him, it shows everything about what that player hopes to get.