I think banning Steemit ads on Facebook is just protectionism, plain and simple. Using the word 'crypto' tries to make it seem like they are doing their users a favour by protecting them from the nasty world of freedom and choice.
This is actually a good sign for Steemit.
Once they start banning you, you know you are a threat. And if a giant like Facebook sees Steemit as a threat, then we know we're in the right camp. because if we are a threat today, just think what we will be tomorrow!