They hated the Windsor family for getting such a huge opportunity. Even though they had implied on various occasions to Marico that they wanted to be a part of his new business, Marico had ignored their good intentions essentially slapping their faces red metaphorically.
They didn't even consider how illogical the reason for their hatred of Windsor family was. Blinded by jealousy and driven by fear, they were manipulated into going against Windsor family by the leader of the Hunter family who was in fact trying to save his own hide for having designs on the Windsor family in the past when Marico was weak.
If these families knew what Marico was thinking after achieving such an overwhelming success, they would definitely spit out a few liters of blood and die on the spot.