MangaDex when yaoi is created:
MangaDex when yuri is created:
Why is there such a big disconnect.
Painting with broad strokes here:
Male readership typically like girls, so Yuri gives a 2 for 1 special.
Yaoi has nothing for them, they have no interest in watching 2 dudes kiss or hug or whatever.
Female readership can be similar in reverse, but may have less readers(on a series like this?).
It's also more common for women to be more affectionate and touchy(in ways that can overlap with romance, ie handholding) with others including each other than it is for men in most cultures.(which makes Yuri behavior less unusual compared to yaoi, with less response)
The same dynamic is at play with loli and shoutas(typically favored more predominately by opposite gender). Or movie stars people find hot and go see movies for.