It should be their responsibility to ensure they implement the strictest measures to prevent their users from falling for scams . Obviously being a private business they care more about revenue/profits which is normal, just like alibaba, pindoudou etc have been tolerating scams/fake/counterfeit/and even harzardous goods on their platforms to prioritize revenues/profits. I don’t blame them, it’s the government job to make sure companies adhere to rules/regulation, in this aspect I think only the EU is really trying to enforce them on tech companies .
anyway, even if they lost that, it won’t be the end of the world , Facebook will continue her operations globally like before, they have no real presence in China anyway. So no real loss per se there . They can still live without this scam ads revenue , obviously won’t be ideal of them.
Point being that Facebook does have something at stake here, and will pay a price if it does not comply with government directives. Which is presumably why they are preparing to comply.