This was stuck to a bus shelter near Liverpool St tube.
It seems too good to be true. Are Transport For London seriously saying that the source of a huge amount of their revenue is under review because they fear it is harmful to their customer's health? Have there really been studies that can measure how materialistic people are? How do we decide what constitutes 'materialism'? Can we then link that to depression and addiction? Unlikely.
The grammar mistake on the very last line gives it away. Other tell-tale signs are that it is not laminated and open to the 'authorities' trying to remove it, see bottom-left and top-right corners. Good hoax though and I applaud the debate it raises.