Jolla has spent years disparaging projects based on the Android Open Source Project (AOSP) for marketing. SailfishOS has a largely closed source user interface and application layer with no equivalent to the open source AOSP. It's far less private and secure than AOSP or iOS too.
Jolla recently launched a new product so their supporters are understandably trying to promote it. As part of that, they've been posting about it in replies to posts about GrapheneOS. We've replied to some of it with our perspective within threads originally about GrapheneOS.

Since we dared to post accurate information in threads about GrapheneOS where they mentioned us in replies to promote it, their forum is being used as a place to attack GrapheneOS including libelous attacks towards our team referencing harassment content:

https://forum.sailfishos.org/t/sailfish-os-clarifying-claims-about-open-closed-source-security-and-privacy/25933

Sailfish OS: Clarifying claims about open/closed source, security and privacy

Actually Jolla say that “Sailfish OS is partially open source, but not fully open source in the sense of “every part of the OS is free/open-source.” After digging deeper and discussing I found GrapheneOS comments: Jolla is a for-profit company misleading people about what they providing. Their OS has extraordinarily poor privacy and security compared to the Android Open Source Project or iOS. Their own OS code is mostly closed source and there isn’t an open source subset that’s usable. Jolla ...

Sailfish OS Forum
Several of their supporters are taking the usual approach of calling us crazy and delusional while referencing harassment content at the same time as calling the factual info we posted aggressive. They're brigading discussions about GrapheneOS with attacks so we made this thread.
Brigading threads about an open source project and attacking the team with libelous claims is toxic. Defending ourselves from it with factual statements is not toxic. Repeating dishonest attacks on our team based on similar attacks over and over doesn't make it any less untrue.

@GrapheneOS I find it interesting that people would be shitting on Graphene now given it's importance in protecting people Trump doesn't like from attacks via their phones.

Projects like Graphene are going to be critical going forward to bypassing on-device support for everything from Chat Control to age verification. Google will make it harder to install unapproved software (e.g apps that don't comply with surveillance mandates) on stock Android phones, but cannot stop Graphene and other 3ed party OS projects from allowing them.

Graphene strikes be as being unique among all of them in its resistance to exploits. If one of these unapproved apps turns out to be malicious it will have a much harder time trying to take over your phone. Same for government officials trying to plant things like Pegasus or Graphite(ICE's favorite spyware). Same for Cellbrite, which admitted a bit over a year ago they could not even get into a locked Graphene phone much less one in "before first unlock" condition at that time. I consider that to be quite an endorsement.

@GrapheneOS Is it a viable approach to purchase their product and develop an attack vector to crack it, and compare how GOS fairs under the same attack?
@GrapheneOS well, this is life dude.