80% of men are betas-omegas and 20% are alphas-sigmas.
The omegas are maybe 2-5% of that. So 75%+ are typical beta males, most of whom are blue pill. Beta runs on a continuum. Some men are more beta than others. Also, at any given point in time, most people are in some sort of romantic relationships. It would make sense that you'd find a lot of betas in a relationship at some point.
It is likely that a lot of these relationships are subpar. The women might not be happy and the men are not happy if the sex frequency is diminishing or diminished.