This is a completely new market and players are currently burning money in order to capture market share. The money will stop flowing in at some point, but until then, you can’t compare it to an industry like aviation which is extremely mature and heavily optimized.

Nah. The software industry never really becomes mature. Microsoft is still spending a fortune churning on new versions of Windows and Office. The moment that OpenAI cuts spending on training they'll start to slide into irrelevance. Training costs are no longer just for compute resources and engineers: now they need to pay for proprietary training data to differentiate from competitors.