This hardware requires very expensive infrastructure, unlike air-cooled ASICs.
Yes, the hardware is different and expensive. But they have a very good cooling system in place.
The biggest problem with computer equipment is heat. Data centers dedicated to AI, which also involve a lot of processing, also need good cooling systems. In turn, there is a lack of data centers ready to receive the AI hardware. The mining companies already have the necessary infrastructure; they just need to receive the hardware and turn it on.
For example, in my country they will begin building a data center dedicated to AI, which will take almost 2 years to complete.