Although most of Musk's cost savings have been as surgically-precise as Leatherface with DTs, Twitter did ink a very bad fixed-cost contract with GCP that left

Although most of Musk's cost savings have been as surgically-precise as Leatherface with DTs, Twitter did ink a very bad fixed-cost contract with GCP that left them with a lot of unused cloud capacity that was being overpaid for. Shutting down a data center likely left them with a lot of capitalized equipment that they could move GCP-hosted data processing to, and Musk isn't shy about exiting contracts, regardless of what the termination clauses might say. In other words, a lot of these savings probably don't come from actual technical efficiencies, just getting out of a bad contracting situation and making use of a lot of already-acquired hardware. (It's also likely that X/itter isn't in a position to make use of the kind of reporting and analytics infrastructure Twitter demanded, so they likely aren't losing much, business process-wise, in shutting that down.)