I dont actively follow crypto but I still know that this is and has been an outdated argument for quite some time. The relevant tokens have switched to proof of work. There are plenty of better things to criticize crypto for.

You know what’s also bad for the environment? Typing on lemmy, you’re using electricity

So many are no longer proof of work based annddr have reduced energy consumption incredibly like Ethereum.

Literally, it’s just Bitcoin and a few other altcoins that are ‘bad’ for the environment. As mining becomes less and less economically feasible for these coins, there will be greater demand for these coins to process more transactions more efficiently.