I'm also curious as to why sometimes books are MOBI and other times AZW3.
Of my Amazon purchases, 8 MOBI files.
Oddly, six of them are 2020 or later. All self-published/indie publishers, by the look of things. Since there's nothing overtly embarrassing here, the ASINs (too lazy to make links right now):
B08PCD9P76, B08R7X4Q7X, B09CN51BCQ, B09LPT13FC, B0B3X2TD3H, B0BB2Z2CQK
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