Remember, when China banned crypto? Does crypto vanished from the world after China ban? But the price went to Saturn as far as I remember.
But China is kind of a special case since people know they're good at banning soon-to-be-successful things

Just to be clear, China did not fully banned crypto/bitcoin AFAIK
I'm not sure about your first sentence and can't comment on it, but China is still progressing well and China is a strong competitor for other Nations.
Regarding the China ban, as far I knew that they banned ICO at first and then there was a news some months ago that they will ban trading or fully ban crypto... Maybe I've misunderstood somewhere or I heard a false news.
It is not Facebook or Google ban news which forced the Bitcoin price to fall that much.
But it was MtGox trustee who sold over 30k Btc and 30k Bch, and you can add the panic sale of crypto traders along with Mtgox trustee.
These two news made the market to crumble. There are many other reasons that we need to consider but these are the few ones.
The market is confused currently due to the news, fuds etc and the result we all can see. But I hope the market will be stable again soon.
yes they are going to banning the BTC add on both google and fb because " The social media giant said it would prohibit ads for financial products and services "that are frequently associated with misleading or deceptive promotional practices." but apart from this every one is still investing in bitcoin and even me also one small step cant control the regulation of btc so i agree with you.. forget about the fb and google and work on it.
No one will be able to stop bitcoin in my opinion. Bitcoin will progress at its own pace. But the way everything is moving forward it seems to me that regulation will be the ultimate result.
Fear not, China is not banning cryptocurrency. because many of the people in china are still trading with crypto that is why the government is planning to take back the restrictions from the Bitcoin.
Ban will not stop any individuals from any country to stop trading. Once I wrote somewhere that the peoples of those countries who banned crypto are also trading and still involved in crypto one way or other.