...because houses are made of cardboard and use electricity for heating.
Here's the latest: electric instant water heaters designed as drop-in replacements for gas boilers in hydronic heating systems: https://stromltd.com
All the inconveniences of a hydronic system and resistive electric in a single solution, what's not to like?
This is the perfect "slumlord special", installed in place of more economical (and ecological) solutions such as A/C knowing full well the tenant is going to pay the resulting astronomical bills.
AFAIK resistive electrical heating is banned in Denmark, except in buildings for only occasional use (summer house etc).