Calling out "whataboutism" only makes sense if the supposed "whataboutism" is meant to distract and bring up an unrelated topic. But the argument here is that no one comments at all on other "frivolous" pursuits that take similar if not more amounts of power. As I've mentioned in other posts, no one complains about the energy usage of video games and porn. It can be argued that video games, porn, and Bitcoin all have utility. So why is it a problem for Bitcoin and not porn and video games?

That's not whataboutism, that's calling out inconsistent logic by detractors.