BOT AI Players State of the Art

Hello,
We are considering PUN for our multiplayer game.
In the forum I read different threads with different solutions for BOTS.
-Some people say one should use the plugins but are they released for the public cloud in the end?
-Some people managed to modify the users IDs for the bots...

What is the current state of the art? Has Exit game updated the API or released something on this?

What is the best way to make Bots player for a racing game? How to split the AI on players? How to manage the MasterClient disconnection and so on...If one player is playing against all local bots how do you manage to see if is not cheating?

Thank you!