There are good entropy sources (as others have indicated)
But just because there are good entropy sources on physical hardware doesn't mean the overwhelming majority of system instances are inheriting those sources well (and not just virtual machines/cloud processing)
6 years ago I wrote about haveged, truerand, and twuewand[0] (specifically in the context if improving the entropy pool for a heavy Java app)
There are also dedicated USB dongles ... but again: they don't help much (if at all) for hosted instances (containers, VMs, etc)
But just because there are good entropy sources on physical hardware doesn't mean the overwhelming majority of system instances are inheriting those sources well (and not just virtual machines/cloud processing)
6 years ago I wrote about haveged, truerand, and twuewand[0] (specifically in the context if improving the entropy pool for a heavy Java app)
There are also dedicated USB dongles ... but again: they don't help much (if at all) for hosted instances (containers, VMs, etc)
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[0]https://antipaucity.com/2016/04/01/improve-your-entropy-pool...