It was a well known, public RFP. Several teams responded. It's unlikely that AT&T won the award for any reason other than how their proposal was scored.
There's a reason procurement decisions like this are delegated to career civil servants - they have much fewer valid excuses to be socializing with vendors.
Corruption in this context usually instead takes the form of job offers post-retirement; and that's usually most common in military procurement, where early retirement from public service is the norm.
>There's a reason procurement decisions like this are delegated to career civil servants - they have much fewer valid excuses to be socializing with vendors.
This is simply false. Regular Capture and the revolving door are rampant at telecommunications companies