[forgot-my-pw]

I think the purpose is so people can create their own variations of the available fonts, not to make animated text.

[alikoneko]

I really hope so. The web will be an unusable mess to me if fonts change size on scroll like in their demo page.

[eyelidlessness]

They're just demoing the parameters you can adjust to build a font. I assume they built the demo the way they did because it's more approachable for most than a long list of sliders with names that might not be meaningful to a lot of people.

That said, the way it works would certainly be off-putting to some. You may find their actual font builder app provides a better experience: https://app.prototypo.io/