 EU antitrust enforcers are asking interested parties whether Googles pledge not to use fitness tracker maker Fitbits health data for its advertising, and to separate the dataset from its own, might ease concerns over their tie up. Alphabets Google made the pledge to the European Commission late on Monday to try address concerns that its 2.1 billion takeover of Fitbit might boost its clout in online advertising and search. To ring-fence Fitbits health data, Google has proposed to set up a structure for data storage consisting of auditable technical and process controls called Fitbit Account Data, the EU questionnaire seen by Reuters said. 