I remember Linux running into a bunch of issues with boot time entropy. Some things were sometimes getting stuck on boot due to that. Also this "lost entropy"

I remember Linux running into a bunch of issues with boot time entropy. Some things were sometimes getting stuck on boot due to that. Also this "lost entropy" thing has long been a bane of VM servers, which could consume vast amounts of it. I think this changed fairly recently. And lots of things have USB ports these days, including things like commercial wifi access points, routers, switches, etc. Some of those have internal ones.