Revolut, N26 and Monzo all have premium accounts with metal cards which are nothing than a status symbol. The banking industry has been doing this for years though with premium credit cards, so it's nothing new.
I have one, and aside from how it's practically useless because I can't top up fiat into it (I currently have to do SGD>EUR>BTC>SGD just to use the card), it's also heavy.
Maybe I'm just the type of customer that they're not targeting.