Over time, the transfer of large amounts of account data from the account provider to the aggregator's server could develop into a comprehensive profile of a user, detailing their banking and credit card transactions, balances, securities transactions and portfolios, and travel history and preferences. As the sensitivity to data protection considerations grows, it is likely there will be a considerable focus on the extent to which data aggregators may seek to use this data either for their own use or to share it with third parties and operator(s) of the website on which the service is offered.[4]