
Apart from obvious attractiveness in younger adults, I’d probably chalk it up to societal norms (and maybe there’s an evolutionary component to it as well) for males’ perceived value on being the bread winner.
So dating younger is how you ensure they are dependent on you, and thus fulfill your purpose as a man.
I mean, when there’s less cross-interaction nowadays and everyone’s in their own bubbles prevent a challenge their preconceptions, it makes sense.
This is affecting all facets of society, politics even.
Also there’s survivor bias: there is also the fact that on these platforms, the impact of assholes in the dating pool is much greater then the good ones, because it’s the same assholes being cycle through the system, whereas the good ones have already reached the terminal state and found their partner.