The following four-year-old article may shed light on the priorities of Upwork: Provide services to bigger clients with fewer (possibly EVT) freelancers.
There could well be a two-tier setup: earn reputation from one and money from the other.
https://www.businessofbusiness.com/articles/18-million-users-have-been-purged-from-gig-economy-site-...
Keep these excerpts in mind:
“Part of the shift may be attributed to [redacted], who emphasized that the company is targeting Fortune 500 companies as opposed to smaller, one-off companies just looking for a quick gig worker. At the earnings call, she spoke of a ‘skill gap’ between what companies were looking for on a platform like Upwork and what they were getting.”
“[Redacted] pointed to three goals for 2020: 1. Attract more, bigger clients; 2. Enable more spend per client; 3. Make more high-quality matches, particularly in Upwork's technical categories of Web, Mobile, and Software Development.”