It's a scam. Have a look at this link and particularly the link about "tips to avoid questionable jobs".
If a job reads too good to be true (health benefits etc.), it usually is.
ETA: Oops sorry forgot to add it! https://community.upwork.com/t5/New-to-Upwork/Getting-Started-on-Upwork/m-p/264214#U264214
While it's not against UpWork ToS to communicate with clients outside of Upwork, Google Hangouts is often used by clients who also intend to take payments outside of Upwork and that's a serious violation. We'll have the job and the client you are referring to reviewed as soon as possible.
Please, check out this post for more information about how to avoid questionable jobs.
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