I have done work for other providers in that space. The pay rates vary massively, and on the high end (providers requiring MSc's or PhD's and doing testing) they are high enough that if you're a freelancer and have dead time it can be worth picking up an hour here and there. The most lucrative project I picked up was actually worth putting aside contract work for, as I was able to negotiate a rate and they paid per task and I was far faster than their benchmark and the end result was it beat my reasonably high day rate by a good margin.

But, sure, I suspect a good number of the people doing this work has either lost a job or are in low cost countries.