I see you're treating Sam Altman as some kind of trustworthy source. Might it be possible that he's making that up -- of course, nobody will ever call him on it! -- and exaggerating the numbers to make his company and team look really good and ethical for not accepting such lucrative offers, or perhaps to make them sour on Meta for not receiving $100M offers?
My guess would be ~$30mm. MyFitnessPal itself, which generates the most revenue of all health&fitness apps, was sold as an undesirable asset for $345 million a few years ago and probably do not have mountains of cash sitting around.
Cal AI are popular and their revenue seems great, but their profit margins are probably quite slim, they rely heavily on advertising and I imagine 80%+ of their revenue is on day 1.