WASHINGTON: The US Justice Department should carefully scrutinise Alphabet Inc’s plan to buy Fitbit because the fitness tracker company is a source of nascent competition for Google, which is dominant in search and advertising, two public advocacy groups said on April 30.

Google announced the US$2.1bil deal in November, as it seeks to compete with Apple and Samsung in the market for fitness trackers and smartwatches. The deal is being evaluated by the US Justice Department to ensure it complies with antitrust law.

Public Knowledge and the Consumer Federation of America wrote in a letter to Attorney General William Barr that because Google has few direct competitors that nascent or potential competition becomes more important.

“It is critical to consider what assets could very effectively offer an avenue for expansion ... if allowed to remain independent and team up with dominant platform adversaries,” they wrote in the letter, which was dated on Wednesday and released on Thursday.

Fitbit, whose fitness trackers and other devices monitor users' daily steps, calories burned and distance traveled, would give the US tech giant access to a trove of health data.

The groups also argued that although Google says it does not plan to use data collected by Fitbit for advertising, it could be valuable to others.

“By keeping the ongoing data streams that Fitbit has access to out of the hands of a competitor or potential competitor, Google may prevent competition it could otherwise face,” the letter said.

Google declined to comment on the letter but has previously noted that it has no products in the fitness wearables sector, and provides tools for users to control their data, including exporting it to other platforms.

A European Union privacy watchdog, the European Data Protection Board, warned that the purchase could pose privacy risks.

The US Justice Department had no immediate comment on the letter.

 - Reuters