Do you have any information about this? Where did you hear this? I'd always heard it was because some people at Apple used Twitter, but nobody used Tumblr, so Tumblr didn't get a free pass from arbitrary torment.
From news links and comments here on this site, especially around 2018 when Tumblr was going through repeated App Store rejections. I think people, including myself, infer it from this information:
1. Apple executives like Phil Schiller used Twitter for years.
