I just found out that the four clubs are owned by the same company, it's no wonder the SPL looks like it's dominated by the same clubs. In addition, it turns out that Al-Ahli Saudi is currently in the second division of the saudi league, but they finished this season perfectly and next season they will return to the SPL again. Hopefully, SPL gets attention from the public, it is possible that it will also have an impact on the AFC Champions League and the clubs that are there.
That is one of their goals, to increase awareness, but not only in Europe, even across all continents as much as possible. There is some centralized control going on in the SPL, but to be honest what would you even expect from Saudi Arabia? Apart from that I still wonder whether they want to develop their own international league in the future with prize money so high that no European club could refuse to participate. That could really threaten the status quo. Buying the players now isn't harmful, but launching a whole new league could be. Something that could be called "The Global League" and they have the money to do it.