Personally, I think that Facebook is doing the right thing since it issues its coin. And for facebook this will give great credibility and soon this coin will cost a lot of money. So the Facebook team made the right decision for the development of their social network. And Facebook will take a leading role in the cryptocurrency market.
I do not like that Facebook does this only in the wake of the popularity of cryptocurrencies. They blocked any ads related to cryptocurrencies for a long time, I know this because I previously participated in Facebook bounty campaigns. And now Facebook has radically changed its decision regarding cryptocurrencies. I can not believe it.