Synology is Taiwanese, not Chinese. If that makes any difference. I run Amcrest cameras on my Synology NAS (actually two NAS boxes). There are ways to keep the cams from phoning home. I don't worry about it too much since all my cams are exterior. If someone in China or wherever wants to watch raccoons eating the cat food or deer frolicking around my yard, so be it. But I seriously doubt anyone is watching. It's boring AF.
There always Eve. They tout their privacy and it works with Apple Homekit Secure Video if you have an Apple TV box or a Home Pod. It's even available in black.
https://www.evehome.com/en-us/eve-outdoor-cam