Mega-scale AI data centers have other externalities. They're often touted as a way for rural counties to become the hubs of the digital era, but they don't employ many people, don't generate a whole lot of tax revenue, and basically just leverage cheap electricity at the expense of local residents. So it's a sham in that respect. You're not gonna have X, Google, Amazon, or Meta reinvigorate your community. You're just gonna have ratepayers subsidize some inference via higher electricity bills.
I have no doubt that someone will chime in saying with an "actually..." that electricity is fungible and therefore, it doesn't matter where the datacenter is built. If it were so, they wouldn't be getting built in places like Wyoming or eastern Washington, and electricity prices in these markets would be the same as they are in the SF Bay Area. In practice, though, there's plenty of factors that make the US electricity markets a lot more local.