No wonder about those numbers. Since last week, @MetaAI was added to WhatsApp, and it was "automatically added" to all your groups. Here in Brazil, people use groups for EVERYTHING, from family, to business, to common interests. Right now I am in 49 groups, and I am FAR from a heavy WhatsApp user. Just there, it amounts to an instant 200M user increase.
And people are calling @MetaAI all the time to create realtime memes or to banter playfully with others in the groups. The results are mostly awful, but are amusing; and in the many groups I participate, a lot of people using it due to the novelty and easy of integration. I am a paid user of ChatGPT (which I use everyday), and @MetaAI is still really, really lacking when compared to it. Yet, it's the first time many people are having contact with AI on a day-to-day basis.
With inflated numbers or not, Meta has really put a dent in the AI market with this move. And, even with an awful AI, that's where the money is flowing currently.