Google made a change to the Chrome Web Store that makes it a little easier for users of the Chrome browser to install apps from the Web Store. Up until now, installation of apps required a Google account, even free apps. For users who only occasionally use the Chrome browser and don’t make use of other Google services, this could be a hurdle to just testing something out. Google’s change will now let users install free apps without being logged in with a Google account.
The change does not apply to paid apps though. This makes sense since Google needs to collect payment and their ecosystem is setup to do that using a Google account.
For developers, this does mean they will need to factor in the possibility that a user is not logged in to a Google account when using the app.
source: +François Beaufort