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At this point we're arguing over nickels
Oh I thought we’d established agreement that Smaug > Bezos, and the matter had moved onto establishing the size of the dragon’s hoard.
In any case, afaik Tolkien himself wasn’t very clear on Smaug’s size. Exhibit A (below) shows a canonical treasure pile only a few times larger than your first estimate. If the depiction is correct-ish, the Forbes calculation and ergo the meme would likely be correct-ish.
(Yea I realise the gold might be 30m deep and extend outside of the frame, but it’s not 1 million m^3)
At this point we're arguing over nickels, once the pile of gold is big enough to bed down a 60 foot dragon, the fact that it's loosely packed 9ct shit doesn't alter the fact that he's richer than Bezos.