There is a difference in your Linux desktop workstation and your most private device. Desktop systems are not nearly as secure and should not be seen as such, and Linux surely at the tail end.
People using F-Droid might not be aware that they are trusting a third party as they think it is a trusted distribution channel, relying on the information stated on the client app or website.
People using F-Droid might not be aware that they are trusting a third party as they think it is a trusted distribution channel, relying on the information stated on the client app or website.