Countries generally can ban certain forms of communication. To contrieve a couple of examples you can have freedom of speak and still not be allowed to shout outdoors at night in the middle of residential neighborhoods. Or send smoke signals there.

And Facebook don't have to prioritise ads from competitors (I think).

That said, banning certain, non-harmful links in user-to-user communication or a whole class of non-disturbing communication comes off as extremely bad form to be.

So, IMO pointing out Facebooks hypocrisy is well justified and doesn't mean we agree with Brazil.