As far as i can see it there is no party losing if a decentralized currency was implemented - neither Zuckerberg nor the users. Zuckerberg may profit from it obviously which is not a big deal (cash ain't his problem) , but more importantly the users get to use cryptocurrencies.
Of course given Facebooks background, how it will be implemented is the question.
Why would a tipping system on Facebook even have to use a cryptocurrency? It would be completely wasteful on a centralized platform like Facebook.
Not exactly. The blockchain properties aren't just decentralization.
The blockchain exists to distribute consensus. If a single entity controls the blockchain there is no distributed consensus but centralized consensus instead. It is much more efficient to implement centralized consensus without implementing all the costly and complicated mechanisms of distributed consensus. It is completely wasteful. And if you think a blockchain would be a good choice for security, remember that banks have centralized databases and they get hacked very rarely.
Goood points! No wonder we have this scaling issue.
We can see that the blockchain is already threating the centralised powers.
A new revolution