The real 10 algorithms that dominate our world
medium.com
medium.com
But it's hard/expensive to get really high rates of true randomness this way (I recently read there are needs that go as high as a GiB/second), so most of these true sources of randomness are used to seed high quality PRNG algorithmic generators, and that's true for Intel's system. Although of course we're not entirely trusting Intel....
You can certainly serve true randomness sufficient to seed cryptographically secure PRNG generators. Right now all my VMs and systems at home are served that from a good source of true randomness.
I've seen such sources on the net, e.g. http://www.random.org/
The big issue is trust, especially when it's relatively easy and cheap to provide true randomness locally. And as mentioned, a standard desktop can generate its own randomness through things like mouse movements, which is very cheap. The major use case would be VMs, and I suspect few who run them would trust an external source, unless their cloud vendor offered it as a service. I could see vendors being reluctant to do so for liability reasons.
'Efficient' qualifies the noun (to) work. It is therefore an adverb and is written as in '... work as efficiently'