I've been using FightBot since I've been with Wurst.
This is just a single way of how you can use Wurst's Amazing FightBot feature undetectably.
This hack set does not violate any Vanilla game rules. So it's insanely hard for anyone or any plugins to detect it. Make sure you use the right settings.
This is mostly useful in PvP modes such as Tank, Speed Tank, OP Duels, Axe Shield, Diamond/Iron (1.19) etc.
Thanks to @Alexander01998 for solely providing us with Wurst.