Capital wins under the current system because the bad guys control your reputation and career, but capital will win under a pseudonymous work system too because careers will cease to exist (or, in any case, will be difficult to assemble) and the commoditization of labor will be complete.
I'm a very "out" antifascist, and I've lost jobs due to my public not-liking-fascists, so I'm sympathetic to people who'd benefit from pseudonymous work, but fiverrization is not the way forward.
The solution is to have aggressive right-to-forget, anti-blacklisting, and anti-discrimination laws, and not only to enforce them vigorously but to go forward on the presumption of employee innocence (that is, innocent until proven guilty).