I dont think it works exactly like that. While they are signed to the program and technically placed on a team by the league, teams and players will have some sort of say in it before the league signs off on it. I think they will also get some payment from the team as well as sponsorship packages.I didnt realise how those contracts work.
The player applies to the league to be part of the 'future stars' program and the league places them with a team.
Thats about the worst they can get.
Lamelo even said he decided on the NBL a while ago, just not on a team.