Tailwind isn't really recognizable at all, since it doesn't ship with any components/style like Bootstrap. It is however such a pleasant way to write code, I'll never go back to regular CSS.
It does come with some default styles (https://tailwindcss.com/docs/preflight), which can be spotted to some degree. There are also some example components, that a lot of people copy, and then transfer some of those styles into other components.
Tailwind UI is looking to change that (of course, Tailwind itself won't change, this will just be a paid implementation)
It's not about the default configuration. This use a set of premade components for tailwind (https://tailwindui.com/).