In my opinion, Tachain is a great project and it can be a pioneer in combining advertising and transport. With the discussion about the money-back guarantee, you get the impression that the project has already failed. I'm still optimistic that Tachain will be successful.
You dont outrightly say a project had failed. There be no guarantee of profits anywhere, but here we find one. I think we have left the basis of this project and are looking at an investor protection part of the project. Its a transportation and advert project. Take a look at the white paper and get the concept.