You can and correct Google won’t review it - that’s why Android shows a warning when you enable sideloading about only using APKs from trusted sources (to my r

You can and correct Google won’t review it - that’s why Android shows a warning when you enable sideloading about only using APKs from trusted sources (to my recollection). Those alternative channels typically provide a tiny percentage of active installs compared to Google Play installs, however.