Thanks for the thoughtful reply Brian.
Flexhire looks good, and yes I am aware that there are other marketplace type services like WorkingNotWorking that do things differently and are far better than places like Upwork. I was too quick to paint them all with the same brush and for that I apologise.
However, places like Flexhire and the others you mentioned, who have better screening processes, have a lot more trust built-in already because only good talent is allowed to join. So the need for ratings and reviews to build trust in systems like that is far less important. It’s the free-for-all marketplaces like Upwork that have the most reliance on online reputation systems, because that’s the only way good freelancers can stand out amongst the noise.
Far better is to get yourself in a position where you’re not competing with the noise at all. Perhaps portable reviews is part of the path to get there.