So why didn't they say ...
..."[T]he consent of the individual [must] be considered as the only possible legitimate basis for all processing [,so] the entire service [will] be blocked as, for example, there is no means to gain consent of non-registered users who may have their personal data processed during face detection and feature extraction ..."?
As a non-user of BaceFook, I do not want my image "tagged" (I don't actually want my image up there at all). The logical conclusion is that, since not everyone can give informed consent, the whole thing should be blocked.
Once again a toothless watchdog does exactly what the money-grubbers want.