I actually been in this exact scenario before. I and another friend were avidly into Hearthstone, and another third person was playing with an Hearthstone Cheat bot in an University study room. We asked to watch for a while.
After a while, some dread was setting in. We started asking questions:
* Why did it hover that card?
"To pretend it's human. The card has less than 10% playrate on that class"
* Did it... just spam the Well Met meme while going face?
"Of course. Because people do it"
* Wait it ropes the opponents?
"Yes. You can set it to rope back"
We kept seeing more and more behaviors. It would squelch noisy opponents. It would even tap the ground pretending to be a bored person. And then it hit me: 95% of Hearthstone players are bots. Every single human behavior that you could perhaps use to identify 'people', it faked.
I quit Hearthstone within that week.