Filing a lawsuit requires nothing but a sleazy lawyer going for a quick cash settlement. I was sued for sex discrimination by a woman I didn't hire. The person I did hire was a woman. The city where I worked agreed to give the woman suing $65,000 and a job plus pay attorney's fees. I refused and we went to court. After a week in court they got nothing.
So, filing a suit excites the idiots. Intelligent people wait to see the results. Cowards settle out of court with the settlement being a secret.