Very, very marginal use cases, that don’t warrant the amount of investment, could’ve achieved with smaller models, and without cooking the planet as much.
It’s a thing to encourage foreign investors.
Honestly, if the Modi govt. is still furthering that strategy, I think that they are out of good ideas and should hand over to another.
Effectively the government paying you to move there by allowing you to not pay any taxes. So if your company is paying $2m/yr in taxes, you’re being paid $2m+ to move your operations. You’ll lose some of that to construction costs, but you’ll likely more than make that up by paying (comparatively to previous employees) slave wages to locals.