On our app we were about 60% women to 40% men. Nonbinary made up a small enough % to round to zero. DAU/MAU were roughly the same, though you might see seasonal swings toward one or another.
Like men wanting to meet women through an app?
Say your users are predominantly seeking long-term relationships, and your branding supports that. Then a bunch of men, fueled by gender-ratio marketing, flood your app seeking hookups. You will see short-term a bump in engagement and payments. A/B testing will suggest everything is great. But long-term your product loses value as your users lose faith in your ability to deliver on what they signed up for. The (in this case women) leave and the product becomes another graveyard.