Tether and Rumble announced they plan to jointly buy all shares of Northern Data, giving them full control of the AI infrastructure firm. In a Monday update, Rumble said the proposal would build on Northern Data’s current AI and high-performance computing (HPC) business. Tether, the issuer of the USDT stablecoin and already Northern Data’s largest shareholder, would support the deal. Tether has also signaled future collaborations in AI, peer-to-peer communications, and data storage. Tether links the deal Tether is the key link in this potential deal. It invested $775 million in Rumble in late 2024, and the two companies deepened…