By using its own system and processes against them. One of Uber's weaknesses is its rating system. Because of the sheer number of transactions, Uber can't possibly investigate all complaints in a timely manner or in any detail. They rely on feedback and make assumptions. Uber's competitors have been smart enough to realise this. Even Uber drivers and riders know this. They know how to use the rating system (a process), which is an integral part of the app to destroy competition. And Uber itself.