I think from one side this is a very good thing. I get a tons of ads every single day with scam ICOs and Ads with "the next bitcoin". There are milions of people that are uneducated on facebook and dont know scam ICOs exist and that is all legit and the people lose so much money only because they believe facebook ads... This is a lead up from the milions of Bitconnect ads that were everywhere on Facebook .
On the other side that is a bad thing for like you mentioned Steemit promoting. But Steemit is the MAIN future competitor for Facebook so i dont wonder why they did that. But anyway there should be some way around for Steemit and all of this stuff if we read more carefully the new rules they put. :)