What stops TCS, a software behemoth to have one digital platform for all bench associates to get themselves on boarded across vacancy?

Exactly, there should be honest and transparent process app similar to linkedin

Actually there is no need of RMG If they develop any system like that.

Tbh, there is one similar thing, you can check in Ultimatix - telent management, i forgot the option name but the app is called iWMS if am right

We can give services to customer only. We can't spend anything for employee.