Yuh. I'm not sure what "strong entropy" means, in this context; entropy's usually reported as some number of bits of entropy. So perhaps "a lot of entropy" is clearer.

At any rate, by default a (CS)PRNG doesn't have any entropy that isn't present in its seed. According to some, at least, that entropy is diminished every time you read from the RNG, so it depletes to nothing after a finite number of reads.

I've finally come to the conclusion that entropy, whatever that means, is orthogonal to RNGs. Instead, RNGs should be classified by their unpredictability. A CSPRNG is one with high unpredictability. And I've given up on trying to build a DIY HWRNG. It was a misbegotten project.