I think a lot of it is our own fault.
Not flying any particular flag here, but, there has been a lot of itching and criticism of men over the last decade or so, particularly in the media. Comedians even make perfectly accepted "jokes" about the casual coercive and controlling behaviour of women towards their partners. I'm thinking in particular of all the TicTok channels about the clichéd "married couple" wherw the Wife is in control and the Husband is nothing more than the punchline in whatever the joke of the day is.
You know the whole "Oh look how angry I get when the waitress flirts with my husband", or "Watch me show my Husband how to properly clean the house/look after the kids/pick up his clothes/teach him to not look at other women" etc.
I think the result is men turning away from "traditional" relationships and choosing to not get married, have kids, live with women. So it leaves a very small pool of genuinely interested guys. The rest just mess around, they have no desire to get into a serious relationship because we basically mock them and everything they do.
So why would they?
They have the pick of the women on OLD because if they show the slightest interest, they know there are women who will give them what they want. Which is mostly just sex, but I think quite a lot of women are hoping that "just sex" might lead to "relationship and kids" so they fo with it.
It's like picking your favourite chocolate in a whole shop full of the stuff, there's always a nicer bar on the other shelf.