That's exactly what happens in places like Finland: Cities are tapping the vast amounts of waste heat generated by data centres, and feeding it into district-heating networks.
If I ask you what is crypto good for and you tell me it is still "too early to tell" and that I should give the technology time to develop I might slap you.
If I ask you what is crypto good for and you tell me it is still "too early to tell" and that I should give the technology time to develop I might slap you.