It's really all based on a cultural selection process. Most cultures seem to have adopted a system where the man takes initiative and the woman accepts or passes based on a multitude of factors.
Since this is the standard, any forum that facilitates match making will have women being bombarded with advances, and the men will have seemingly nothing by comparison. As a man you will always need to keep attempting to make connections until it works. But, women get the opposite where they have to keep rejecting bad offers until they find one that they like. Plus, there are diminishing returns for larger forums. If you're at a bar and you have enough self-confidence, you will have more connections with fewer attempts than if you're on a dating site. This is partly because the higher volume of people give women more reasons to pass up offers.
For some men the stress of having to fail so many times, and that meeting their future partner feels like some socially constructed chore instead of a fated meeting, makes them just decide to forget the whole thing.