I thought CAs automatically filtered out really low keys. There's a great Suckerpinch video (https://youtu.be/M1si1y5lvkk) about trying to purposely make the least secure HTTPS page possible, and Tom initially tried to choose a laughably-low number as the key, but the CA automatically rejected it.
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[ 1.2 ms ] story [ 5.4 ms ] threadhttps://.mozilla.org/showbug.cgi?id=2083449
In this case I wonder if this was an intentional wide open doorway to fraud
They literally were too lazy to type more than just a single '4'.