- Syncthing is available in the Play Store. If it wasn't, I could use F-Droid or simply download the app from Github.
- It works in the background and it has access to my folders. I can take a picture and few seconds later it's on my PC without having to change or move anything.
Not saying that iOS is bad, but I felt tied when I had to use it. It's not for me.
I just found out it's a regulation from France regarding encryption (mostly declarative paperwork), so it's not an Apple App Store thing. Seems like Apple's App Store enforces it, but maybe not Play Store? And so either it may be published but may not be in compliance with regulations, or SyncThing did the paperwork but Mobius Sync did not.
I could care less about that, I just want it to appear in Files.app
... but it's not available in the iOS FR app store (is it available anywhere but in the US app store?), so, deal breaker.