And that explains why they have another separate 1 billion+ monthly active users on Instagram?

If they didn't think their main product would decline or get unpopular soon, why would they bet on spending $1B on buying Instagram before anyone else and copy the greatest hits and main features found in other competitors (Stories, Disappearing posts, etc) directly into Instagram first?

Without Instagram, Facebook would likely have sunk much faster and I already said they will be around for 10+ years.

So the death of Meta Platforms has been greatly exaggerated.