Most Euroleagues have a much greater pool of talent and can obviously afford players that are either ex-NBA or fringe NBA.
Four players have gone from the NBL to the NBA this offseason alone LaMelo Ball, RJ Hampton, Jae'Sean Tate and Will Magnay.
These new players have played in the NBA before so see the NBL as potentially a stepping stone back into the NBA: Jarell Martin, Orlando Johnson, Vic Law, Donald Sloan.
Other guys on NBL teams who have played in the NBA before include: Bryce Cotton, Miles Plumlee, Isaac Humphries, Nathan Jawai, Scott Machado, Casper Ware, Deng Adel, David Andersen, Scotty Hopson, Mitch Creek and Lamar Patterson. Andrew Bogut only just retired too.
In other words, Go away troll.