How did the Ferengi get their hands on plans for a Genesis Device.? I figured plans for something like that would have been erased or locked up very tight.
A Mk. 2 Genesis Device was shown to be locked up at the Daystrom Institute's top secret space station in the final season of ST: Picard.
Since the original device was unstable and a failure, not only has the technology been preserved to the 24th century, but perfected as well.