Honestly, it never fails to surprise me when on a presumable anticapitalist forum such as this one, someone makes a passionate argument in favor of some of the most ghastly corporate practices known to man, but sure, let's put that premise to the test, shall we?

Here's a good article on the power consumption of Bitcoin, which estimates around 110 TWh/yr.

Here's one on the electricity use of online advertising, which estimates somewhere between 6.5 GWh - 131 TWh/yr.

Shall we call it a draw? Keep in mind that online advertising is a fast growing industry (and likely to continue to grow in the future), whereas Bitcoin's power use isn't likely to grow too much, as the above article explains. Also keep in mind that this is JUST online advertising, and completely ignores print, TV, and those digital billboards that are spreading everywhere from Times Square to your local grocery store. Think about neon store signs, illuminated billboards, etc.

Also, that's just the cost of delivering ads to people (i.e. it doesn't even include the cost of producing them). Think about how many people work in advertising – all the offices they occupy, the computers, cameras, and whatever other equipment they use, business flights, what have you – and I'm pretty sure the carbon footprint of the entire industry far outstrips that of crypto.

But sure, crypto is the real problem.