Receuiters can be rude to you, they can miss meetings they schedule with you, they can reach out about a job and then ignore you, they can mislead you, they can waste your time on phone calls, they can send you spam email, and they do it all with impunity.
The real problem is that Recruiters have no accountability in the process aside from getting butts in seats.
HR tools keep getting developed to refine that filter candidates for skills and personality but never to bring in the much needed accountability missing from the process.