"We have tremendous respect for the incredible work you do to provide this vital service in cities all around the world and to create work opportunities for millions of people globally."

Suggests that it is addressed to employees creating jobs, which would be the full time employees.

It is addressed carefully to all Uber staff - we know they don't have normal staff with drivers.

I think 'the umpire has spoken' and that Benchmark know that this well crafted letter will carry enough weight to be heard by everyone. I think it is a masterstroke by them to write like this.