In France, there are at least two companies that are trying (or tried) to commercialize something with a similar idea : domestic radiators that produce heats from embedded computers that are used as cloud infrastucture. - https://www.hestiia.com/en for the end-user market - https://qarnot.com/en that seems to have since pivoted to low-carbon footprint HPC (was mentionned here -- in French -- as doing computer-based heaters : https://www.takagreen.com/solutions/qarnot-radiateur-ordinat... )