Facebook had a cloud. It was called Parse. They bought it in 2013, then they promptly shut it down in 2016. It wasn't a failed product. It was in use by hundreds of thousands of customers. But it didn't align with their "vision" or whatever, which of course no one noticed when they paid $85M for it three years before, but visions change and whatever.

Point being: they squandered any trust they'd have been able to gain in that arena, and they're competing with the most powerful companies on the planet. I don't see it happening.