I tapped a plain.txt file in the Files app and expected Preview or Quick Look. Instead, iOS opened it in a short-video app (xxx Short Drama). I was very angry and deleted that app. When I try again, iOS opened it in a web-novel app (xxx Novel). Both imported it into their bookshelves and had cloud sync on. I never set either as the default for .txt. There was no prompt and no warning.
The file contained confidential work notes. Two taps in Apple's own file manager gave full copies to two third-party companies.
For a company that sells the iPhone on privacy, this is a bad default which is absolutely ridiculous. Generic file types like .txt should open in Apple's built-in viewers until the user chooses otherwise, and iOS should ask before any third-party app becomes the default opener.
Has anyone else run into this? Is there a setting that stops apps from taking over file types without asking?