This experimental mode is currently being applied to Chrome on iPhone and iPad.
Chrome's Incognito mode is set to become more robust and useful than ever with a completely new experience being tested early by Google for iPhone and iPad users. One of the most notable features is the ability to open links from various other apps in Incognito mode by default.

It's unclear when this feature began rolling out, but Google has already enabled it by default for some users, while also hiding it as an experiment. In other words, some users will need to manually activate it to experience this new Incognito mode.
Once the feature is activated, every time you open a link from any external app outside of Chrome, the browser will immediately ask if you want to open that link in a new Incognito window or if you just want to use Chrome's standard browsing mode.
If you choose Incognito, all standard precautions will be applied — Chrome won't save history, cookies, or other information, and you also won't be able to access cookies or logged-in accounts on your browser from Incognito mode. This feature will be most effective when you want to handle links found in messaging apps and social networks privately and securely.
Note that the new Incognito mode experience has not yet been implemented by Google on the Chrome app for Android as well as PC.
(See QTM for more information)
