Does Facebook have a representation in those countries?
Besides that, we're not talking about porn. Unless you want to see breast cancer videos and mothers feeding their children as porn but that would be a perception error, the label simply does not apply.
Facebook has offices in Dubai, Mumbai, Hyderabad, Singapore. These restrict internet pornography by law; even though much of actual Internet traffic may still be porn, businesses do not wish to associate with it because porn could provide a too convenient legal handle to prosecute representatives or shut down services as a retaliation for publishing things that are e.g. critical of the local government.
Of course we are not talking about porn, but drawing lines in the sand is a murky business.
Burkas, burkinis in France. (It's a bit more complicated then that, hence the scare quotes.)
Depending on who you ask, it's either because of some hand-waved nonsense about public safety, or because liberal Western values include telling women what they can and cannot wear.
Besides that, we're not talking about porn. Unless you want to see breast cancer videos and mothers feeding their children as porn but that would be a perception error, the label simply does not apply.