We have quite a bit of insight into Indian scam centers thanks to the work of scambaiters like Jim Browning[1] who frequently hack into their CCTV cameras and desktops.
The big difference is that the workers in India are voluntarily employed. In fact they often work for companies that do legitimate customer support as well, so they maintain the facade of doing “service” for their “clients”.
It’s also worth noting that Indian call centers focus more on tech support scams rather than romance scams.