Two of the companies dominating the third-party delivery space in the US have made interesting acquisitions in the past couple weeks. DoorDash announced it acquired the salad-making robot company Chowbotics. Uber said it will acquire market-leading alcohol delivery service Drizley. CSP: Uber To Buy Liquor Delivery Co. Drizly; Rest. Dive: DoorDash Acquires Chowbotics On the…