The argument is that if you do that, returns will naturally come your way.
The issue is that many people never provide surplus value at all; some can't, and that is obviously completely acceptable (people who are disabled, have medical conditions, or who for some other reason cannot). But those who are able and choose not to provide surplus value are who he's talking about.
You may not agree, and that's okay, but that's the argument.
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.
And all they got for their efforts were applauds.
Reality is that without their work all our societies would have failed and fallen.
Almost any common folks agrees that for example nurses aren't paid enough.
The real issue is that our "valuation" scheme is controlled by the wealthy not by the people and the only metric is what makes the rich richer.
Or take nurses for example. You really think they provide low value? Tell me more, when you are seeing a hospital from the inside at some point. Yet they are not paid much.
At a personal level you can live your life similarly, add value where you can. You can do that by joining an organization that adds value as well.
When it starts to feel like work, it starts to feel like needing wages for it.