Reminder: Even demographics are against incels [RedPill]
The reasons for this are very simple...
1) The male to female ratio at birth is circa 105:100. Assuming that every woman has a male equivalent according to attractiveness (e.g. the equivalent of the most attractive female is the most attractive male, and so on), this leads to almost 5% of males not having a female equivalent their age at all. So even the most hideous and fat woman in your area and age group would be above the bottom 5 percentiles of men (aka truecels). The 105:100 ratio basically remains unchanged until late adolescence, when it slowly begins to approach 1:1. This ratio is finally reached around age 50 - a poor consolation for all those dispensable, young sub 5-percentile males out there.
2) But the reality is even worse than that. Most western countries have a fertility rate below replacement level (less than 2.1 births/woman). As a result, each year the number of births will be smaller than the year before. For males, this has disadvantageous effects on the dating market. Women generally seek out partners who are 1-3 years older than themselves and vice versa. However, the low birth rates result in the situation that there are fewer young females out there for the numerous older males.
As an illustration, I've got some numbers from Germany from 2014, where the fertility rate is very low:
Number of men born in 1991: ~479,900
Number of women bon in 1994: ~406,800
Male to female ratio: ~1.18
As you can see, for sub 15th percentile men it would be virtually impossible (or very hard) to find a girl three years younger than themselves (i.e. girls who would be the most receptive to their approaches). Sure, they can try to find a girl their own age but then they will have to compete with men who are some years older who are again a)more numerous because of the falling number of births b)more mature and therefore generally more desired and c)have a higher income. The only other alternative seems to be MILF-game.
I think the change of fertility rate is also the reason why getting a partner as a man is percieved to be more difficult now than it used to be because the fertility rate was higher back then. This also applies to (many) third world countries. A 25-year-old man in Nigeria, where each year there are considerably more births than the year before, can have his pick from an abundant pool of women who are 20 and younger. Hence, inceldom is most likely a non-issue in such countries whereas every first-world country is known to have a significant percentage of young men who simply stay behind in terms of dating.
3) The number of single immigrant men often exceeds the number of single immigrant women. Men are more likely to have the financial means and the willingness to take risks to immigrate alone while the women who immigrate are often already engaged of married. Of course, immigrant men try to enter the local dating market. On the other hand, natives often can't access foreign women the same way because they come from cultures (Muslim, Hindu) where women are heavily discouraged from having premarital relationships. In many Western European countries a big part of the immigrants comes from such cultures. Even if foreigners, especially ethnics, have a hard time dating local women, some of them will succeed due to high individual LMS or some kind of racial fetishism from the woman. Even a relatively small percentage of women who are open to dating foreigners is enough to skew the odds in the dating market a little bit against men once again.
tl;dr: If you're a truecel and objectively belong to the most unattractive men in your age group, it really doesn't make sense to even try and waste your energy. You can actively look out for the most ugly girls on the street - chances are you're still statistically below her in todays dating market. Just concentrate on escort-game and hedonism in general