Ok, but they didn't even create the SL, it failed in a few days.
I don't want to defend them, as I also think what they did was wrong, but I believe that this was all a "ridiculous plan" planned by foolish people.
I think UEFA is causing a lot of drama... is such severe punishment for something that didn't even occur is really necessary?
In reality, UEFA has no exclusive contract with clubs. Also because the registrations for the tests are made annually, according to the result of the national championships (except for the winner). As much as UEFA can do is not accept a club's application for competitions it organizes.
But that idea of banning players from playing for their countries is that they can't do it anymore! Each country has the right to choose any player, for its selection, even if it is an amateur club.
EDIT:
For example, football at the Olympic Games is not a competition organized by FIFA. Therefore, there is no jurisdiction over this competition, and any country can participate. The only difference is that clubs are not required to authorize their players to play in this competition.