Google blocked or removed more than 5.5 billion adverts that violated the online company’s guidelines or were intended to serve fraudulent purposes last year. A Google report on ad security, which was published on Tuesday, says the blocked content included adverts for dangerous products or sexual content, but also adverts that promised a miracle cure or quick riches in a dubious manner. Google’s vice president, Duncan Lennox, said the company’s aim was to recognize fraudulent ads and block the accounts responsible for them before they reach the Google platforms, or remove them immediately as s…