No, I'm arguing the opposite. People should be free to accept any job they want, regardless of what it pays. I'm simply saying that employers shouldn't be allowed to profit from the labor of people who are supplemented by welfare.
That doesn't mean they shouldn't still be allowed to offer jobs that pay less than what welfare can provide. Because even those jobs are valuable to some people, and some of them would continue to be filled, even if welfare "paid more". Some people would still work those jobs because often there's more to be gained from a job than a wage. Some people are more interested in the learning or future opportunities a given job might provide. Some don't need to earn an "honest living" to get by (you really should re-read that Bucky Fuller quote a couple more times and think about what it implies). And other people will work the low-paying jobs because they can't find anything better and don't qualify for welfare, or choose not to utilize it for various reasons. .
Finally, many would choose to go on welfare rather than work a shitty job for low pay, and that's fine. Those businesses who are truly surviving on "socialized labor" would either change their business model, or go out of business. But by outlawing low wage jobs as a blanket policy you put everyone above out of work, essentially punishing them when they're harming no one.