A human puts pink-tainted glasses on, looks around and asks: what is the purpose of everything being pink?

There is no purpose. Everything is not pink. One sees everything as pink because of the glasses one wears.

“Purpose” is a tint on the human mind. Everything the mind sees, the mind overlays with purpose. If there is no purpose to life and existence, it is because purpose only exists in the human mind, and the mind hasn’t made one up yet.

If you want to know the purpose of life and existence, make something up. Your purpose will be as good as any. You can then get lost in your fantasies about purposes to your hearts’ content, desperately trying to wake up.