The market exists - I have a product from another company - Bluetti - (1).
The Pila is a beautiful device, but that beauty comes at a price - it's a lot more expensive than, say, Bluetti's range of portable power stations and others too. They are also expandable, connect to solar panels and so on, and apparently the German market has embraced batteries like this with solar panels to give your home a degree of independence very easily.
These are everywhere. You can even pick them up at Costco, Best Buy, and other retail electronics distributors. They're a lot cheaper than the linked product, too.
I think people are getting misled by the Powerwall comparison. This isn't a powerwall competitor. It competes with all of the other battery power stations on the market, of which there are many.
EcoFlow, as best as I can tell from chats with Ukranian folks, has become a generic term for such battery backups. They are very common given the load shedding.
The Pila is a beautiful device, but that beauty comes at a price - it's a lot more expensive than, say, Bluetti's range of portable power stations and others too. They are also expandable, connect to solar panels and so on, and apparently the German market has embraced batteries like this with solar panels to give your home a degree of independence very easily.
(1) https://www.bluettipower.com/collections/power-stations