Because AI and robotics are completely different thing. AI is software, so it can just use the well developed computer hardware we have, has no intrinsic material cost, can be taught by YouTube videos and be made by anyone with some technical knowledge and a computer.

Whereas moving objects around requires robotics which, while mu h more accessible than it used to be, still requires specific parts, which can cost quite a lot and denying on the project night have to be custom made, and you need an actual lab/workshop to do anything remotely high end or reliable. And then when you have a design for your dish washing robot you jave to pay the material costs and labour for each one you want to make, whereas an AI you can send the binaries of the bot around for free and run it on existing hardware people have.