Yes, because the infrastructure that Proton hosts their service on is “infinite”. Everyone knows that Amazon charges the same price to reserve one instance of EC2 as they charge for reserving 10,000.

What exactly do you think the “cloud” is composed of? Fairy dust? It’s composed of all sorts of finite things - servers, storage, networking, electricity, etc. etc. etc.

Welcome to literally everything? It’s called volume-based discount. Just like if you buy a box of cookies from the grocery store, you’ll pay a fuckton more than if you buy a pallet of cookies from the exact same company.