All game participants are real people. There are no bots. None of our games have automated players, automated scores or any sort of robot players at all. Full stop. It is also against the terms of service and players will get banned if they are using automated helper programs to get an advantage.
The Skillz system does include auto-generated names and pictures for player accounts that can "look fake", but this is done only as a way to let new players enter the game more quickly. These are still real players though. It is true that some people prefer not to include real profile pictures or simply don't know where/how to setup their own name and picture. We are working with the team at Skillz to improve this part of the system so that more players will personalize their profiles earlier.