grayway2 The worst part is probably the fact that this company is marketing Sailfish OS as a secure mobile operating system with modern security functionalities
These companies sell false marketing in most cases, according to some of my research, selling unsecured phones and making them look private has become a business since Edward Snowden's revelations in 2013, or it's simply that these companies have always been interested in making money first.
Linux has a positive image among some people concerning security and privacy, which is probably why they use it, but Linux is not secure with its monolithic kernel and memory-unsafe C language, as well as other problems, we need to stop relying on the Linux kernel as the core of the operating system and the foundation of the security model and move towards a microkernel-based model with a Linux compatibility layer etc.
While AOSP at least deploys modern security techniques such as authorization control and appropriate application sandboxing, Sailfish OS is similar to Ubuntu Touch, i.e. it lacks even the most basic security and privacy features.