According to Google: > This enhanced fraud protection will analyze and automatically block the installation of apps that may use sensitive permissions frequent

According to Google: > This enhanced fraud protection will analyze and automatically block the installation of apps that may use sensitive permissions frequently abused for financial fraud when the user attempts to install the app from an Internet-sideloading source (web browsers, messaging apps or file managers). It probably hasn't since they started doing this last year, but once scammers find out you can publish your own malware F-Droid repo, they might.