beIN getting massive fines for the Saudi's stealing their broadcasts?
The PL, on several ocassions, attempted to hire lawyers in Saudi Arabia to take legal action against Arabsat. Needless to say, they didn't have much joy attempting to sue a state owned company in Saudi Arabia.
And why do you say there's no reason to stop the deal? There is the fit and proper owners test. Mohammed bin Salman is the ultimate owner and controller of PIF. All things being equal, do you believe the man that the US senate found responsble for the murder of a journalist a fit and proper owner? Do you think the man/state that FIFA and the PL found responsible for the biggest organised piracy operation ever to be fit and proper owners? Now I said all things being equal because I know that the PL picks and chooses when they apply fit and proper owner tests however the rules are very much in place that give the PL grounds for blocking this deal. Again, that's not to say that they will. Historically the PL have avoided getting involved in legal battles whenever possible.
edit: the reason why this beIN story is big is because the one thing that has motivated the PL is money. beIN sports are one of the biggest rights holders and could possibly become the biggest in the coming years. The PL won't want to bite the hand that feeds them.