As far as I know this app still works though, I don’t think we should be too quick to remove seemingly unmaintained apps simply because they haven’t been updated in a while. If an OS update breaks PrivacyBlur it may still receive a patch in the future for example, we don’t really know until that happens.
Some of these tools like PrivacyBlur are single-purpose tools which can be “complete” after all. This app only does one thing, it’s not a browser or operating system.
Also, we do already have a warning about blurring text.