False positives of the kind you're thinking of aren't possible--it's checking for hashes that match known bad images, not running machine learning/image detection to detect if the photo you just took contains bad content. The issue is that there's nothing stopping Apple/the government from marking anything it finds objectionable--like anti-government free speech--as a Bad Image, beyond CSAM.
Additionally, tenants are often unaware of their rights and don't exert them for that reason. Others are aware of their rights but don't have the resources to fight if their landlord violates those rights.
Isn't that the beauty of OSS? People can fork projects for whatever reason they want to.
They are not at all hostile to GIMP--they encourage donating to the GIMP org--but I think their reasons for an alternative are sound:
Glimpse Image Editor is an optional alternative intended to assist users that are offended or made uncomfortable by the "gimp" name, and assist free software advocates that encounter barriers when they recommend the GNU Image Manipulation Program to friends, family, coworkers and employers.
However, Glimpse does have some other differences from GIMP which might interest you:
We also focus on making the software more "enterprise ready" so it is easier to modify and distribute for schools and workplaces. That means fewer "easter eggs", improved build and packaging tooling/documentation, backported fixes on a known-stable base we support for at least a year, and a more efficient Windows installer. We also plan to have a more predictable release cadence, as that will assist IT departments with their software deployment schedules.
I've used DDG as my default search for both desktop and mobile for about a year now. It's good enough in a lot of cases, though I still find myself using Google for a lot of local searches and current events-related searches.