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Clients should not be asking freelancers to actually do work as part of submitting a job proposal. I am saying this as a general fact. I have not looked at any jobs the original poster is wondering about.
If a freelancer sees a job that violates this rule, they can flag it using the "Flag as inappropriate" link button.
Trying to stop cheating clients is like trying to find honest politicians; it's not going to happen. Trust your intuition and also check with Upwork support, tell them who the client is and ask what they can tell you about the potential client's history on Upwork.
Please do not contact Upwork Customer Support to ask them about a potential client.
Upwork provides information about clients.
Look at the information that Upwork provides, including their feedback history and hiring statistics. Read the client's job posting.
Upwork Customer Support personnel do not have any "special" or "secret" information about clients that they can provide to freelancers.