In any case, they must first make the testing platform closed, and then they should check for the users themselves under load.
Of course, the platform should be well tested before freelancers and customers come to it en masse. I hope that the team will make this platform as convenient and practical as possible.
Just if there are problems or some bugs on the platform, then it will all end badly, so you can even lose your money by paying for the service and not getting the finished job.
Pay money to good testers, make a closed beta platform and already check for errors, then there will be no problems, as a very good option