An insurer has started cancelling the policies of drivers who are working with personal coverage. The Toronto Star has now reported that it has received an internal bulletin from the Aviva Canada auto insurance company and that has revealed that it is cracking down on UberX drivers who are covering themselves with personal policies but who are using their vehicles for commercial purposes. Estimates from the City of Toronto show a monthly average of 500,000 UberX rides in the city. Now, one of the largest auto insurance companies in the…