Starting this Wednesday, many Australian teens will find it near impossible to access social media. That’s because, as of Dec. 10, social media platforms like TikTok and Instagram must bar those under the age of 16, or face significant fines. Australian Prime Minister Anthony Albanese called the pending ban “one of the biggest social and cultural changes our nation has faced” in a statement.

Much is riding on this ban—and not just in Australia. Other countries in the region are watching Canberra’s ban closely. Malaysia, for example, said that it also plans to bar under-16s from accessing social media platforms starting next year.

Other countries are considering less drastic ways to control teenagers’ social media use. On Nov. 30, Singapore said it would ban the use of smartphones on secondary school campuses.

Yet, governments in Australia and Malaysia argue a full social media ban is necessary to protect youth from online harms such as cyberbullying, sexual exploitation and financial scams.

Tech companies have had varied responses to the social media ban.