After dealing with security concerns like the Google Docs phishing debacle, Google has been adding quite a few new security features for its services and apps, including better protection for Gmail accounts and whitelist procedures for G Suite users. Now, the company is adding a new warning screen for any apps from developers that haven't gone through Google's app verification system, yet.
Apple has a similar process in place for OS X called Gatekeeper (which isn't without its flaws), and Windows 10 blocks non-store apps, as well. When you come across an unverified app, you'll get a notification alert of that fact. To proceed, you'll need to type in "continue" in the provided field, which lessens the chance you'll just hit an "ok" button and potentially get exposed to malicious code. As TechCrunch notes, the warning also contains the name of the app and its developer to further help you screen out phishing attempts. Developers can also test out their apps without having to wait for verified status, either, since users can bypass the warning.