But I think that change in definition has been harmful to those covered by the original definition, who are now denied the possibility of a positive identity and supportive community that Alana's original vision offered them. Indeed, any attempts today to found such an identity or community, especially one which is inclusive of heterosexual men, are going to be very quickly tarred by association with the new definition of "incel".
[1] https://www.bbc.com/news/amp/world-us-canada-45284455 but also I remember some of this: I was never actively involved in Alana's website, but I can definitely remember stumbling across it in the 1990s
But all of the self-improvement stuff doesn't help if you, say, have Goldenhar Syndrome, or a major handicap, or perhaps you have some very unfortunate facial features, or you have to care for an elderly parent, or any number of things.
It isn't always as simple as "people who haven't been trying hard enough."
Sounds like the sort of people that those who are worried about their lifelong lack of intimacy should be meeting!
The momentum is driven largely by the 'incel' online movement, and the large proportion of the world's population that isn't sexually or romantically active in the way they'd like to be but isn't interested in their nonsense can happily not associate with that movement and not be associated with that movement. The only way you start getting pigeonholed as angry is if you start imagining a 'pro-sex movement' that inexplicably hates you... (I'm not even sure what the 'pro-sex movement' is. Evolutionary biology? The traditional family? The 1960s? The current emphasis on genderfluidity and consent? none of those seem particularly hostile to the idea that people might be involuntarily celibate.)