20 million developers used to be the gatekeepers to software. Wabi CEO Eugenia Kuyda on who gets to build now:  "The only people who could make software up until last year or so [were] just professional developers... Very few people in the world." "Even if you have a good idea, go ahead, find an engineer, find a co-founder, find a technical co-founder to build this. But you can't really otherwise build it... It requires a lot." "But now anyone can." "This is just wild." "Before  we had to…