I knew someone whose wife filed one when she filed for divorce...just because it was easy. They are still married today.

I think she did it because he was unfaithful, kind of a revenge thing.
My
ex-best friend since college had a restraining order on her husband. She and the kids still lived with him at the time. When he was sober, he was fine. When he got drunk, he would beat the living crap out of her. The kids would jump in to protect her, and she'd actually take more of a beating to protect them.

She had the restraining order for when she had to call the cops, so they knew whose story to believe when they showed up. Without the restraining order, it is "just" a domestic dispute and cops don't like to get involved with those (unless there is violence,) with his word against hers. The restraining order was to show a documented history of violence.
This was all, from
her telling me this. And it went on for years. I finally dropped her as a friend, years ago, when she let it continue and I realize this was just a dance her & her DH and the situation wasn't going to change.

It would have been one thing if it was just her & him, but as kids were involved, and she refused to get out for their safety & well-being, that's when I got out. To stay her friend was to be condoning their little dance. I just couldn't do that.
It's ironic, because years later, I'll bend over backwards to help a woman with low self esteem, lack of self love issues, to get out of abusive situations - BUT only if they are really willing to walk the walk. Otherwise, I am out of there. I won't waste my energy & time on people who just talk & suck people's energy & sympathy by
remaining a victim. There are many people who really want & need help that I can be helping instead.