They say its a bit under 1% of developers. According to this article, they have 34 million registered developers: https://appleinsider.com/articles/22/06/06/a

They say its a bit under 1% of developers. According to this article, they have 34 million registered developers: https://appleinsider.com/articles/22/06/06/apple-now-has-over-34-million-registered-developers https://appleinsider.com/articles/22/06/06/apple-now-has-ove... So, it's probably within a factor of ten of 340,000 developers. That's a lot of apps.