After fb - what does Twitter and Other Social Media think about removal of advertisement ban?

Hello Guys,
Since the beginning of 2018 we have seen number of hurdles to the crypto currency industry. From the some part of the world there was a serious problem of regulation and ICo act arises. While some major social Media Platform prohibited to advertise about Crypto Currency advertisement
.
Facebook has now removed its ban on crypto currency related advertisement and now it has allowed to add in. while there is still prohibition for ICO and binary option is continue.
Now the question is that why it has done so. what was the reason for fb to remove such ban and started to allow such pre- approved crypto related advertisement.
Look minutely to the growth and annual earning of the fb:

Here you can see that earning and growth has been slowing down.
Now the turn of other big player of social media to rethink and remove the blanket ban of crypto currency advertise.
As this has been proved that the whole crypto currency market is victimize by some fake ico and ponzi schemes.Only such illegal activities must be banned rather than the whole market.