So it seems like you get the $250 back if you honor the terms and leave by the end. It's an interesting monetary incentive, not unlike the bottle deposits.
As it stands it isn't an incentive, its just a disruptive and opportunistic approach to take money from a politically disfavored group. THe CBO, as quoted, is clear that until they figure out the reimbursement process they are still just going to colelct the fee and keep the money:
>, “CBO expects that the Department of State would need several years to implement a process for providing reimbursements. On that basis, CBO estimates that enacting the provision would increase revenues and decrease the deficit by $28.9 billion over the 2025‑2034 period.”
They are bound to cause trouble, and a major VISA overstay risk.