Yup. Considering BVB is not joining, they will milk every ESL club for him.
His price is now in the range of 800 to 1BN Euros.
I dont really know how transfer rules apply if one of clubs is not part of the FIFA pyramid anymore.
In the EU we have "freedom of movement worker laws". No employee can be
forced to work at a place he doesnt want to be in. That would be slavery.
So afaik any player could have always simply quit their working contract at any point, even without a release fee. But the catch was that this player could not get registered for a new club within the FIFA competitions. He would simply be banned. That's why noone did it.
But this isnt a FIFA competition, it's a new construct. Haaland could simply say "I quit" and then join a new association that doesnt ban him from playing. What's stopping him?
Obviously this would spark a lot of controversy, FIFA would essentially take the ESL to court again and eventually after years of lawsuits the European court will pass a law that regulates this (just like back then with Bosman).
But until then players could just freely switch inbetween these two paralell competitions just like an average person would switch jobs, and there are no current ways to prevent this.