Slightly different motivations in play. For a start, how can they be femcels if the whole premise of the app is to screen men for the purposes of safe dating? Secondly, screening men so you don't get abused is not even in the same country, let alone ballpark, as doxxing people on 4chan because you're an antifeminist incel, an actual incel, who wants to score points with other worthless societal lip crust.
Was it a perfect app and did everyone on it comport themselves impeccably? Of course not, but you'd be an obtuse bad faith dickhead to demand otherwise. It's just the case that these are the kinds of lengths women have to go to to protect themselves.
And let's be clear, men do the same shit. Men talk about their bad dates with psycho women and warn each other about them, and they share nudes and other private stuff that the women didn't intend to be shared amongst the man's friend group. We don't need an app with photographic evidence and licence plates and addresses because the abuse men face is usually not being raped or beaten to a pulp. But if you're a pickup artist or a virulent incel, you'll probably have a database of women you've compiled for reasons other than your own safety. Stop pretending that the stresses of relationships that men and women face are equivalent.
That app is an emergent property of decades of men's grotesque behaviour. Technology has now put some power into the hands of women so that they can quickly and efficiently share info with each other, and you expect them to wave away that power and just let RNG dictate whether they have a normal date or a survival horror video game.
Fuck 4chan, fuck incels, the end.