In most jurisdictions the commissioner has the power, at least in respect of frivolous and vexatious, as does the court. It's not abused. As far as I can see, it's very judiciously dealt with. But it is useful, because there are individuals who would try to monopolize the system and overwhelm it.
It's very easy to overwhelm the system when you only have to pay five dollars, or whatever the minimal amount, to make a request. It's very easy to see that it could be used in negative ways. But I don't think it's abused, in my experience, in any event.