Uber Technologies Inc. used illegal practices to stifle competition and obtain a monopoly that drove a smaller rival out of business, a company affiliated with now-defunct ride-hailing pioneer Sidecar alleges in a federal antitrust lawsuit filed Tuesday. According to the San Francisco Chronicle, the lawsuit claims “Uber became hell-bent on stifling competition” and used subsidies and made fraudulent ride requests to competitors in a bid to dominate the market.