You do realise it’s a luxury not a necessity? It’s entirely your choice to go there (or not). I’m sure there are cheaper places if you don’t mind it from a basic machine. Of course, the price of coffee (bought in dollars, with a weak pound) and food inflation at 16% is going to push prices up, that’s not a problem unique to Costa and a lot of people effectively voted for that, so I’m surprised it hasn’t been more popular
Costa is now bankrolled by Coca Cola and was bought for billions and they are investing lots in their existing stores and new ones, it’s not going anywhere soon.