This vendor cooks up blocks of rice candy in his home nearby, packs them into his carry-basket, and brings them down to this mini-park near a busy bus stop to patiently perform the work of breaking the larger blocks of candy into bite-size pieces and placing them into small plastic bags. The tool he uses to break apart the candy - picture a metal shoehorn that has been bent in the middle - also serves as "acoustic advertising": the sound of his hammer upon the metal implement notifies passersby of his presence.
Consider for a moment you are the victim of theft. Would you still consider it theft if what was "stolen" was something of no value or use to you? What if someone is merely capitalizing upon your otherwise unused exhaust/residue? How would the transformation of something you personally had no previous use for cause you to reassess its value, and make you classify someone's re-use/repurposing of your waste as "theft"?
Although typical street vendors must consider how best to display the goods they sell, there are also plenty of interesting examples of vendors displaying available services. For this sidewalk-based masseuse/manicurist, the display (and advertising) is simple: the pink chair is for clients, the wired-together green plastic stool is where the masseuse sits, and the remaining stool acts as the "shelf" for holding nail-cutting tools and fragrant oils for anointing customers' feet. When I walked by, he asked whether I wanted a pedicure.
This sidewalk-based key & lock guy repurposes his space by hanging keys, doorknobs, and other trade items from the window behind him (along with his sign, claiming he fixes any and all kinds of locks and also repairs, buys, and sells safes). Consider how the space for an informal sidewalk-based business is valued, and the factors that affect that space's value. Like other, more formal businesses across the world, such space is partially judged by more widely recognized metrics such as visibility to pedestrians, amount of usable space available, and so on.