These apps do not rely on manufacturer servers. Instead, they turn your phone or old device into a server, or they connect directly to the RTSP (Real Time Streaming Protocol) stream of your camera.
Generic camera apps often request broad permissions. Always to your contacts or location unless specifically required for the camera to function.
To help you find the absolute best match for your device, could you tell me: What or brand of camera are you using?
This rips out the Chinese proprietary software entirely. You replace the "brain" of the camera with clean, auditable code. You get RTSP streams, MQTT control, and absolute ownership.

