I think the OECD has established a process to ensure that this doesn't happen, in the sense that, because there were certain minimum standards agreed to, the OECD also established a peer review process whereby they would review each country to determine whether it has complied with the minimum standards. Really, the stick, so to speak, is pressure from the OECD and other jurisdictions to ensure that the countries abide by the minimum standards in one of the different optional ways they can do so.
On February 7th, 2019. See this statement in context.