This is quite exciting in that it removes plastic waste. I see no reason why different companies can’t make different shape ones to maintain their lock-in. I expect a knock-off market to pop-up, but that exists with plastic pods too. It’s a step in the right direction at least.
“coal exists, so coffee is sustainable, but not coffee in pod form” is legitimately one of the dumbest things I’ve read on this site, so I’m just surprised you’re hitching your wagon to that post