If you are looking for another one: I use https://sqlitestudio.pl which is GPL-3 only and also cross platform. I'm not sure I ever compared them, I think I just came across sqlitestudio first and it stuck.
I've used both DB Browser and SQLiteStudio, and I prefer the flow and interface of SQLiteStudio.
It's been a few years since I've used DB Browser, so I forget exactly what I didn't like about it. Maybe I should download it again and try it out one more time and see if I still feel the same way.
Most OSS software is not signed, as Apple, MS, etc require you to pay to sign. I know there are some non-profits that will sign OSS stuff for Windows, but I don't know of any that do that for Apple devices.
I run on MacOS, I have no idea how I installed it, but I haven't had any trouble.
