A new provision in Google`s developer content policy will prevent developers from delivering application updates directly via their web-servers. This will protect users from rogue Play Store apps that go rogue once installed. Google is looking to stop miscreants that have their app approved into the Google Play only to update it later with malware and attack users right from a platform they consider safe. This may also mean that users will not be able to fetch, say, an emergency fix right from the developers` website, and must wait instead for the update to be approved.”]
Source: https://www.bitdefender.com/blog/hotforsecurity/google-bans-off-market-updates/