If you're looking for an alternative to ECOVACS, Polymath Robotics has a full autonomous navigation package for industrial off-highway vehicles. It's not directly applicable to household cleaning, but the company's package includes waypoint navigation, path planning and obstacle detection and avoidance, which could be used for more specialized cleaning tasks. It's a good option for those interested in automation and efficiency.
Another contender is Cheetah Mobile, a mobile internet company with a range of AI-powered products. Its OrionStar division offers AI solutions and hardware robot applications, which could be used to develop more advanced cleaning robots. Its focus is broader, but it has a range of AI-infused products that could be of interest to those looking for more advanced robotics.