Well for starters Meta has a lot of consumer facing stuff like social networks. And they are also able to produce hardware devices (being a much bigger company too). OpenAI had to invent the whole AI market but building customers is harder.
The bigger question is why google is so incompetent with AI now. Granted they still have Google Search monopoly but I think search without going to Google will be the future.
I do wonder if the most profitable AI stuff is coming from Microsoft due to their B2B skew.