I always like the projects that kills many birds with one stone.
By using used bottles, they are not only minimizing plastic pollution problem, but also minimzing the cost of material. I still don't know about their process, how are they gonna turn these trash bottles into plastic and then use it to make a frame (quality of the plastic after the process, looks good on video and pictures though), but the idea itself is genious, noble and profitable too.
...and the final good point, these frames will be recycleable themselves ... win-win-win.