They can do what all expats in China already need to do to access facebook, google, gmail, instagram, twitter, whatsapp, etc: use a vpn.
This is an interesting argument against walled gardens I don't often see: that it gives your government an easy chokepoint to prevent users from using software it doesn't like.
Much easier than having to bother with a VPN, and many Chinese people are already used to jumping through such hoops.