Warners intentionally released every 2021 film simultaneously on HBO Max in an attempt to drive subscriptions. It's likely impossible to attribute marginal subscriptions to a specific film on a service that offers thousands of them plus episodic television, but long run, if the service doesn't die and competes reasonably well with Disney+ and Netflix to drive up AT&T's market value for decades into the future, especially if other telecoms and ISPs start to dwindle in the face of disruption, it's worth it to lose accounting profit on a few specific wide releases for a year or two.