Let say employer has awarded you a project on Freelancer  Website. 

Employer has not created any milestone for this project and didn't have verified their payment etc. 

If you will accept this project then you have to pay to Freelancer according to their rule.

Let's you have completed project and given to employer. What's the possibility the employer will pay? This will lead to loss of Freelancer.

So my question is "is it safe to start working on such projects?"