I’m trying to connect to my home’s ground wires. I am a tenant so it’s not my property.

I see that the outlets here have the hot, neutral, and ground wires - but I’m a little suspicious about how the ground wires are connected to the receptacles (I checked multiple in they’re done in the same way). They’re kind of just tied around a screw on the receptacle.

Is this bootlegged? Can I still connect my copper wire to the one in the outlet to get the ground current?

I’ve attached photos.