> I'm not sure why it wouldn't make sense for some of these talented engineers to work for an indigenous tech company.

India doesn't have the same structure, existence and prevalence of VCs with large pools of available seed round and series A money that are necessary for a start-up to acquire enough funds to realistically train a model. Particularly with the hardware/datacenter costs involved in that. There's a reason why a huge number of motivated and talented Indian people form companies outside of India.