How could a set of guidelines to control the actions of bloggers and other influencers?

In 2016, the Advertising Standards Authority of Singapore (ASAS) finally released their Digital and Social Media Advertising Guidelines after three years of consultations with the advertising industry in Singapore to come up with a workable model.
With the growing use of social media, old advertising guidelines were no longer fit for their purpose, so a more formalized set of rules had become necessary. In March 2015, during the consultation period, a key problem arose that seemed to sum up the inadequacies of the old guidelines.
Wendy Cheng, or Xiaxue, a prominent blogger, posted instructions from the social influencer network Gushcloud, whose clients include Coca-Cola and Amazon, for a youth marketing campaign being launched on behalf of the telecommunications company Singtel.
In these instructions, other bloggers, Twitter account holders, and others were told that they would receive free smartphones, cash, and discounts if they directed their own readers and friends to join Singtel’s Youth Plan.