I recently got one such contact through telegram with a so called Chinese worker asking to use my upwork account to get jobs and he will pay me a share of what he makes through my account. I had a quick chat with him to know how he got my contact info and it looks like they just scrape every profile on github and upwork and my username on github was thesame as the one on telegram. After sending him a meme of Kim Jun Un and asking him if he works for him he quickly deleted our wholesale conversation.