The 8-bit USB AVRs are a bit long in the tooth now, and I don't think the host-mode supporting chips ever had much traction.
The last I heard (years ago) was that Atmel stopped production of the AT90USB647 chips in favour of only producing AT90USB1287 chips for applications that needed the host mode, but I haven't seen any development boards using the latter for a long while now.
In general, people are migrating towards more powerful ARM chips
if they need USB host mode, as the extra RAM/CPU power is useful
in such applications where USB hosting is desirable.
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