Personally, if I wanted something to not be read by anyone I would never leave it in the source image and pixel blur it out. That doesn't make sense. Why leave the original text there at all? Cut the entire area out so there is no text, and nothing that can be reversed in that cast. I'd even take it a step further and say that once you cut the text out, screenshot the image and use that instead of the edited original, that way even embedded edit/undo/smart os features can't accidentally leak out the ability to undo to the original.
Funny. I was doing the same guided by some gut feeling, and then the Pixel vulnerability was published, where people would recover original images from the images cropped in Pixel album app
