There is also some sexism and structural disincentives
I know nothing about chess. DH takes DS to club, he sits in a cafe with the other dads that drop off. When they go for competition weekends the club pays for a twin room for him and DS, and he watches chess for hours then the club goes out for a meal and talk about chess for hours. Had I ever played chess as a child or ever cared about it perhaps I would partake more but no thank you. Also DS doesn't really want to share a room with me anyway.
When I drop and collect from club I'll do it screeching in at the last minute with other kids in tow like the other mothers because I'm multitasking.
Most of the kids coming out seem to be either white autistic British boys, or with parents from a country where chess is a more revered sport like Russia/China/India. Could be ND boys as well, but definitely with parents who have a history of playing chess without the ewww boring factor we have here.