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First, as for your taxes, you do not need the 1099int. Just make sure you include the interest on your return.
As for what is going on, various federal laws apply and don't apply depending on jurisdiction. The online bank may be out of a foreign country not subject to US tax reporting laws or not. The party responsible for tax filing depends in how the merger went down. There are various ways one business is bought or merged with another and depending this, the orginal or new bank may have the responsibility to issue the 1099.
With all that said, the FBI website which is who has jurisdiction, has a place to electronically provide information if you feel laws are being broken.