According to industry data, iRobot's Roomba dominates the smart vacuum market with a 75% market share by revenue in the U.S. The FTC's antitrust review includes a look at both head-to-head competition and whether the deal would illegally boost Amazon's market share in the connected device and retail markets. Earlier in August, Bloomberg quoted an Amazon spokesperson saying that the company would continue to supply retailers with iRobot products and sell competing devices on Amazon's retail websites.