Right now, we are not enforcing the account limits, so you can connect as many accounts as you want.
By the end of the year, we will provide an interface where you can choose which accounts you link with your license. You will be able to change your selected accounts, eg. if you lose a client. At the same time, we will provide an option to buy more accounts in addition to the included ones: 3 (single data source) / 20 (Pro package) / 100 (Super Pro package)