Lot of doomers gloss over the fact that AI is bounded by the laws of physics, raw resources, energy and the monumental cost of reproducing them.
Humans can reproduce by simply having sex, eating food and drinking water. AI can reproduce by first mining resources, refining said resources, building another Shenzhen, then rolling out another fab at the same scale of TSMC. That is assuming the AI wants control over the entire process. This kind of logistics requires cooperation of an entire civilisation. Any attempt by an AI could be trivially stopped because of the large scope of the infrastructure required.