As you point out, someone begging to fund travel certainly fits the description of non-contributor to society. But many (most?) self-fund their ongoing travel,

As you point out, someone begging to fund travel certainly fits the description of non-contributor to society. But many (most?) self-fund their ongoing travel, whether through odd jobs while traveling, savings from a previous stable employment, or "digital nomad" work on the road[1]. In that sense, they're just shifting a portion of their contributions from time period B to time period A, in the same way that spending during retirement works. I don't see how this can be described as "feel[ing] no shared responsibility to contribute to society" any more than someone who spreads their contributions more evenly over time: it's just describing the use of money as a store of value.