Regarding concerns about the Chinese government and potential backdoors, I can’t speak for other products, but SafeLine has taken acctions to protect user privacy. First of all, it’s self-hosted, so all data stays within your own environment.
I believe you can find if your SafeLine instance is sending any data to servers in China.
On the SafeLine dashboard, you’ll find two data-related programs that are enabled by default: “Malicious IP” and the “User Experience Program.” If you don’t want any data to be sent back, you can simply uncheck them—this will stop all outbound data transmission.

If you’re using the free personal edition, you’ll notice that SafeLine has no external connections at all.
If you’re using the professional edition, the only external connection is to the official SafeLine License server, which is used solely to validate your license status.