Anything which is in under control of someone has the security breach risks because they own the entire control and if some hacker find a way to break that security shield then everything will be gone that is why centralized projects will not make better future.Facebook itself selling data so they won't consider this as breach only loss to them.
And I think this can also happen to the blockchain, do you think that nobody made a blockchain system, however there must be someone behind the control of the blockchain ?
Even so far we still not see any proof that blockchain can be hacked, only some exchanges right ? But still, its still possible that blockchain will be in breach someday.