There are those who believe that F-Droid’s role as a “middle man” vetting and building packages from source instead of blindly shipping builds provided by upstream makes it a security risk, because you’re trusting F-Droid in addition to (some say instead of) the upstream developer. Perhaps telling is that none of these critics can offer an alternative solution.
Before anyone mentions Obtainium and Accrescent, these are not alternatives to F-Droid, they solve completely different problems.
I’ll be “that guy”:
F-Droid is a software repository, not an app store. The distinction is subtle but important. A software repository offers a community-curated collection of software packages whereas an app store is just a marketplace for software developers to offer products to end-users. A software repository serves the interests of its community first, whereas an app store is merely a means for developers to sell products to end-users.