This feature could be deemed as a masterstroke for Google Duo app resulting in increased app usage. However, these will be audio calls and the recipient has the liberty to accept, hang up, change cameras or mute their mic.
Reports, however, say this ability to make Duo calls to even those who aren't using the app is now restricted to Android users.
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Like a regular Duo call, the recipient of the video chat sees live video from the caller. Users who received a call from a Duo user but do not have Duo installed themselves can answer the call by dragging the phone icon up. If the user navigates away from the call while still connected, there is a persistent button that will put the Duo caller back into view. With this ability, Google Duo app could successfully establish a connection on phones that don't even have it installed. Of course, this also works with audio-only calls. But, most of the Google messaging apps are caught up in a hitch at this stage, pushing few users towards either Allo or Duo. Until now, one of the major requirements for it other than a working internet connection (obviously!) is to be using the same app or software to make the call. Also, it will display a pop-up that lets the person block the caller from contacting again.
Google loves to introduce new apps from time to time and sometimes they become standalone options. Google has been making the feature available to developers through an early access preview program with the promise of opening it up to all developers of messaging apps at a later date.