I understand that you are concerned with clients asking to communicate with you outside of Upwork. You can report this to us by flagging the job. You can read more on this help article and also, please check out Tips to avoid questionable jobs. You might also want to check out the information here to learn more about staying safe on Upwork. Please feel free to also send me a PM with the job post link you're referring to so I can check with the team.