Well the link I included is to a very well respected manufacturer (based in NY) that supplies laboratories internationally. They supply micro-spectrographs of some of their products. The product I linked to is well priced and contains 99% single layer graphene.
So rather than accepting an article that is issuing a broad warning without any investigation, people can find real graphene at reasonable prices with a small amount of research.
I’m sure fraud is an issue. But remember that fraud occurs for anything of value. Cables, Rolex’s whatever. People can do a small amount of research to get the real thing.