I wish that argument was trivially true. Yet we see tons of disadvantaged people working the real tough jobs helping the elderly or sick and they are getting precious little in return.
And to a lesser degree, I have been doing nothing but providing value. All my projects are free/libre, yet returns have not come my way at all. In fact people who could make returns come my way, for example by offering me a job that I am clearly well suited for, refuse to take a look at these projects.
Perhaps the argument is also about non-financial returns, and things like friendships, but I don't feel especially well connected either, even though I try to help anyone I can help in the areas I am active in.
I don't think the argument matches reality, unfortunately.
The "real tough jobs" pay little because the marginal job of that kind does not really create that much value. That in turn happens because the most disadvantaged tend to crowd into these jobs, to the neglect of other, more value-creating activities - yet another issue that might be handily addressed by UBI.