Reading the board needs no account. Putting something on it does, because a post is signed and a contact card belongs to somebody.
YOOP is an information board, not a transportation provider: it sells one thing, a way to reach the student who posted. It arranges no trip, carries nobody and vouches for nobody, and it never sets, collects or guarantees the price of one. Complaints are read by a person, and answered within three business days.