This is very well executed fundraising campaign made for the German section of Reporters Without Borders from earlier this year.
The idea is simple: buy a whistle to support the work of organisation for whistleblowers like Chelsea Manning and Edward Snowdon.
“Whistleblowers pay a high price for the freedom of information. Yours is 6€.”
The whistles are for sale on the campaign website.
If you really want to criticize the campaign, then you can say that it is a worthless gadget. It will go away in a drawer, or worse, in the garbage. However, the symbol is relevant. And funny too.