Sounds like PSG maybe pushing that as their business case seems to be buy the best and put them on wages no one else can afford. Creating a new elite.So clubs can only spend 70% of their revenue on wages surely this is just another way of helping the big clubs like Real Madrid Barcelona Manchester United pay higher wages and therefore attract the best players.
Thereby making it harder for clubs that have recently come into riches to attract the best players.
Once again it's all about protectionism for the established clubs and making it harder for smaller clubs to pay bigger wages.
This will deter investment into the market such as the proposed takeover of Newcastle.