
The Linux Mint logo appears next to the words "System Package" on any package that's not a Flatpak. This gives the impression that Linux Mint is endorsing the package, or at the very least approving it for distribution - even on packages that only exist in third-party repositories. For example, after installing Vivaldi browser, it appears in Software Manager like this:

IMO you should only use the Linux Mint logo on packages that are actually distributed by Linux Mint. Perhaps use a different, more neutral icon for non-default repositories. A simple option is a generic download icon.