On HN there's always a good chance you're talking to some of the people involved in those "negligible" installations. I know that I submitted some patches to Tatu Ylönen for Ssh to compile on Ultrix, so that must have been in 1995 or early 1996 because after that I didn't have access to any Ultrix machines. I may have been an early adopter, but it didn't take long for ssh to take over the world, at least among Unix system administrators; at Usenix within a year everybody was using ssh because there wasn't any alternative and in terms of security it was a life-saver.

As for the RSA patent... I don't know what license the original Ssh was released under, but it was considered "freeware" when it came out and nobody cared about the US RSA patent. Maybe technically in the USA you shouldn't have used it? Nobody cared.

And the mouse-jiggling thing... not specifically a PuttyGen thing. On linux /dev/random device gave you a few bits at a time stingily, only after it had enough entropy, so it was common for programs that needed good randomness to ask you to jiggle the mouse because that was one of the sources of entropy, so bits random bits would come faster. I'm pretty sure that was still the case well into the Zips.