You're missing the point.
If we're going to start legislating how we're all allowed to use energy that civilization has made available, who gets to decide what's allowed?
Numbers I've seen suggest that global PC gaming alone (excluding consoles) currently uses about as much electricity as bitcoin. Should we ban that too since playing cards are readily available and use almost no energy? Maybe we can make a concession and only allow low powered handheld consoles?
If bitcoin mining actually becomes problematic, then by all means we can definitely ban it or add some sin taxes to it, and we probably will in a lot of jurisdictions. I'm actually kind of eager for that to happen, because it will force miners to actually become novel/stranded energy ventures. They'll be the capital drive that builds out energy sources that not enough humans live around to justify tapping and/or we can't economically justifying building without expensive transmission infrastructure. And once it's built out and paid off, it may be a lot easier to justify investing in building out long distance transmission infrastructure so the rest of civilization can also tap into these sources.