They cost more to run in electricity than they generate, sure. But if it's the user's electricity, the person running it might not care. People still do CPU mining with stolen AWS servers even though CPU mining is inefficient.
>People still do CPU mining with stolen AWS servers even though CPU mining is inefficient.
I seriously doubt that. It's not just "inefficient", it's completely useless for bitcoin mining. It's something like spending $1000 in electricity to make a cent or two. It's not even worth the time to hack.
If you had that much cpu power under your control, you'd make more just selling it on darknet for 1% of its cost.
But never attribute to malice that which can be adequately explained by incompetence.