However, if you are talking 'cryptocurrencies' that means you are talking about all of them. Not all cryptocurrencies are like Bitcoin, and Ethereum and not all of them use PoW. So the title should be:
'Is Bitcoin, and Ethereum to blame for High GPU Prices?'
or 'Are cryptocurrencies like Bitcoin, and Ethereum to blame for High GPU Prices?'
Rather than generalising for 'ALL' active cryptocurrencies in existence, which everyone knows isn't true but continue to attack anyway.