I'm confused how the licensing of users' content is intended to work.
The site states that you own your content[1] but then on its manifesto page[2] states that all information is in the public domain. The license itself[3] is not particularly clear.
Putting information into the public domain does provide for maximum freedom in terms of how the information can be used, but that's because the copyright owner renounces their rights.
[1]: https://frizbee.co/#WhatMakesFrizbeeDifferent558b273db212a