The problem is upwork takes a 20% cut and has bad terms and has a very flaky client base, while everything that VC money touches pays way better but hires non-contract fulltime only (fine) and has these rediculous interview cycles that I never seem to pass through.
I think if you put me in a stack of candidates that did leet code, i am basically never in the top 3 fastest, so that makes me unemployable in a system where resumes dont matter, personality is suspected to be bullshit, and speed of test completion is the only metric that can be used to rank candidates. Not in the top 3 fastest test takers? Get fucked.
I've never interacted with UpWork. My experience is that smaller companies pay fairly well, the interview process is usually easier, and you can learn a lot more about development, and that particular industry. The down side is that office politics matters more, you might have challenges with setting realistic expectations, and you might have trouble with comparisons to the last programmer they hired/fired.