I've been using KeePass for almost 20 years now, used to host the database on Google Drive. I started using Syncthing about a year or so ago, including Syncthing-Fork on my Android devices. It's nearly flawless - I sync the database across 6 devices (two phones, two laptops, gaming PC, NAS [which is backed up regularly]), so there is the occasional conflict maybe once every few months, but I think that's more user error than anything else. It's fairly easy to resolve since Syncthing clearly labels the affected file.

It's very important to remember that "Syncthing-Fork" IS NOT the official Syncthing project. Syncthing-Fork uses Syncthing under the hood while providing a mobile-friendly wrapper.

Edit - Re: Syncthing Fork "drama":

Catfriend1 (the original maintainer of Syncthing-fork) recently put in their 2 cents.

TL;DR - The new dev is fine.

For me personally, the fact that 1) devs from both F-Droid and Syncthing itself have reviewed and confirmed that the code is safe, and 2) the original maintainer vouched for the new guy, is good enough for me. There will always be those who refuse to trust anything, even from the original developer, and they are often the most vocal about it - i.e. the "vocal minority". Whether or not you want to listen to their criticisms is up to you. IMO, they're just beating a dead horse.