But what does it do? The landing page is very rough and gives me no idea why I should entrust it with my OpenAI API key
I guess technically you could put a spending limit on it, but from your perspective that's a really long onboarding flow.
See the " ...why install? " link.
The PWA really is only useful when it's installed. It makes it really easy to send a recipe from the browser directly into the pwa. Bypassing having to scroll through any ads.