Why does it seem like modern music is borrowing and using melodies from other previous songs?

More recently the song “ anxiety” by Doechii has borrowed the same melody from “ Somebody that I used to Know” by Gotye and Abracadabra by Eminem is borrowing the melody from The Steve Miller band is there no such thing as originality anymore?

Why does it seem like modern music is borrowing and using melodies from other previous songs?
Post Opinion