Most of the comments are about the technical or logistical challenge of making this work, but I've got a separate concern. Who would want to pay Amazon for their heating bills? Facebook? Google? They already turned the internet to shit and made fortunes for the privilege, why would I want to pay them for waste heat? What regulations exist to make sure they don't reroute the heat away from my house or apartment while I freeze? What halts them from gouging prices for heat that is a literal byproduct of their actual business? Like I already have enough problems that come from my power and heating company being an effective monopoly on my region. I don't trust data center corps from creating the same, or worse, problems.