Shokubutsu Mahou Chito de Nonbiri Ryoshu Seikatsu Hajimemasu Zense no Chishiki o Kushi Shite Nogyo Shitara, Gyakuten Jinsei Hajimatta Kudan - Vol. 2 …

[MangaDex]

 

[Kaarme]

First Elt asks those two not to tell anyone, the next moment he's planning to spread the skill around to increase output. The knowledge would spread 100%. If those supernatural skills only appear in 1 out of 10k people, it's guaranteed even the dryad skill, which would be of little use to most people, would be highly attractive. But I guess this is not the kind of series where actions ever have unwanted consequences.