Because in that scenario, the househusband is the product being sold, just as in all the other dating apps women are the product.
In the end, dating apps are a business and businesses exist to make money. They don't exist to make anyone happy.
Newsflash. It's true that you can't sell a product the public is unwilling to buy but it is equally true that you cannot sell a product that doesn't exist.
So go find me a sizeable enough number of men willing to serve themselves up as a househusband, vet them for being an actual househusband and not a loafer trying to coast on someone else's labor, in order to justify the labor to build this business. Let's see if we have a product to sell before we worry about whether or not there's a market.
I'll wait.
You keep trying to skirt around the very real fact that most men are trapped into conditioning of their very identity being determined by whether or not they can dominate and provide and put the onus completely in women, wimens choices, women's brainwashing, and women's fears.
Not gonna fly, my guy.
There's no doubt unwinding that social comditioning has abling way to go in women.
But there's also no doubt that women are much further along than men, by and large.
My dad would be very offended to be called a househusband, even though that's what he is. His roll is supportive. Still, it wounds that male pride. Stepmom, on the other hand, has no problem with the roll reversal. In her calculus, he is still providing. He's providing labor and support, which is what she needs. She doesn't need a paycheck. She has her own business.
It's like that with every reversed couple I've ever known, you're the first who's ever expressed otherwise but you're part of the kink community, which means you already had a natural interest in exploring and shedding gender tropes as part of your sexual expression.
The main hangup here is not the women. It's heteronormative men thing such a huge chunk of their identity into being a Provider & Protector ™.