I disagree. Blockchain and crypto currencies that use PoW are a terrible invention. Bitcoin mining alone is now using more electricity than Ireland, and this figure is only increasing even more. In an age where the global effects of climate change are becoming more and more apparent while still too little is done to mitigate it, maybe we should not exacerbate the problem even further This applies especially to something like crypto currencies that, so far, provide very little in terms of tangible societal benefits.

We could of course discuss PoS solutions, but those have their own drawbacks, and that still would not change the fundamental fact that crypto currencies and blockchains have yet, after roughly a decade, to find any kind of non-niche use case. Google needed far less than a decade to become the dominant search engine. Netflix did the same of video streaming. Modern smartphones exist for about as long as Bitcoin, and they have become globally ubiquitous. So how good can the blockchain really be?