> Do you think a women's dating safety app is mainly about women lying

That's not what it is intended for, but many people after relationships end can be extremely emotional and sometimes very spiteful. It's not uncommon for people to embellish or lie about the truth to make themselves look better and the other person look shitty. Especially if you're the one being dumped, you may be even more likely to engage in petty behaviour.

I personally have experienced an ex making up a sexual assault story. This kind of app didn't exist then, but she even went as far as reporting me to the police. Luckily the police investigated and could easily discern it was a lie. Going to the police is obviously a much higher burden than using an app, and yet many females still go make false SA claims there. Do you really think it wouldn't be a common problem for people to do the same in an app at a much higher rate?

People often believe things like SA claims without any evidence and will often even attack people trying to defend the person or insist on some kind of proof. It means that someone making up bull crap on these apps is going to be treated like it is true, yet the rates of lies would likely be pretty high.

People can just be so crazy when it comes to relationships/love. Especially when it comes to people in their teens or early 20's, the brain isn't fully developed and dealing with these emotions is even more challenging and leads to even more rash decision making.