because r/flying and r/aviation exists
end
Also as the first few replies mentioned this forum just feels more old school, so young people (I mean new users) won't be drawn in that easily. Older generations go onto pprune and read 5000 word essays , while younger generations are more drawn to a casual chat on Discord. Young aviation lovers are still significant in number, just that instead of making an account here they just join an aviation related Discord server or watch a pilot YouTuber, none of which will expose them to 5000 word essays and "boomer humor" on a daily basis. A very good representation of this is memes - for a starter on how different generations are go watch some kracc bacc or shidbot420 on YouTube then compare these videos to Facebook memes. (friendly reminder: do not wear headphones)