We were starting to see some gameplay that went against the intent behind enabling foreign aid in Tournament Edition. The intent, as per the original suggestion, was to restrict the FAC wonder to require 2,000 infras in order "to prevent abusing cash received upon starting a new nation. Nations must build before sending aid." We were seeing zero day old nations acquire over 2,000 infras, purchase the FAC, and begin sending foreign aid on their first day. A requirement that a nations must be 14 days old before sending/receiving foreign aid has been added. New nation creation has been re-enabled.
Johnny is right about some of the back-end mechanics. Forgive me, it's been over 18 years since I coded some of this stuff and I missed some of the impacts when adding unlimited foreign aid. This is why even after this long, the game is still technically in beta as per the terms, because I have and will continue to make changes on the fly in order to address concerns like this as they arise.