A new risk, if the chip is locked by KEY, then the board is worthless unless you know the key, it have no second-hand value like GPU
The key doesn't prevent unencrypted designs from running. Keep in mind, if we didn't do this it would also open an attack vector where a developer could maliciously burn the efuse preventing any designs from operating but their own.
I'm pretty sure you were already told this on discord?
no, i did not talk on discord, i review it. also i found the pdf,xapp1267,eFuse is OTP,it can lock the chip to a key.
So if you reviewed the documentation you would know that the chip can still load unencrypted bitstreams (assuming you use the correct options).
Once the key is loaded, yes, the key cannot be changed.
The ram key is wiped when the board loses power. The board doesn't have a battery.