Parts of the world seeks to push them towards heating homes instead of wasting the heat/burn more energy to cool the servers. It's an uphill battle though as these big tech companies prefer a race to the bottom where they rather pay to greenwash themselves than make an actual difference. As I understand it this is a developing field to optimize and increase energy efficiency of big data centers. They can often offset their carbon footprint by providing heating to the towns they're built in, if only they're willing and it don't cost them too much...