I'm willing to bet dollars to doughnuts that Google and Facebook have at least one, possibly 2 or more orders of magnitude more latent training data to work with - not including Googles search index.
My uninformed opinion is that Google and Meta's ML efforts are fragmented - with lots of serious effort going into increasing existing revenue streams with LLMs and the like being treated as a hobby or R&D projects. OpenAI is putting all its effort into a handful of projects that go into a product they sell. The dynamic and headcounts will change if the LLM market grows into billions