It is better to uninstall it.
People who still have Google Allo installed on their devices and who simultaneously use the mobile version of the Avast anti-virus on these devices have noticed that Google Allo has been marked by this anti-virus as malware. The problem was noticed on Google smartphones – Pixel XL and Pixel 2 XL with Android 10 installed, updated to the latest version, as well as on LG Nexus 5X.
Although it is suspected that scans performed on smartphones by the said antivirus may give Google Allo a false positive result, Avast has not yet commented on the case. It is not known, therefore, whether the application is really a threat or not. However, for your own safety, it is worth removing it from your phone.
Problem with Google Allo also appeared on Huawei smartphones – P20 Pro and Mate 20 Pro. People who did not uninstall the application when its support was terminated, or downloaded its APK file from an unofficial source and installed it, saw on the screens of these devices a warning saying: "Security risk. Google Allo can be infected. Immediate uninstallation is recommended. "
Source: Android Authority
For Huawei smartphones, it is also unknown whether Google Allo users are faced with a false alarm. The Chinese corporation has not yet referred to the above information.
Since Allo is no longer supported by Google, really it is not worth using it. We encourage you to download another messenger from our application database. We've included links to several suggestions below.