CASE STUDY Tengi is a messaging app with a difference: every week users are entered into a free prize draw to win up to £1000. Funded entirely by advertisements, the company is committed to giving away half its revenue to users every week, and has awarded over £50,000 to winners since its launch in May. The Challenge Messaging platforms operate in an incredibly competitive and saturated market. Tengi’s impressive expansion so far is a produ

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