Yes, when you scan a QR code or enter a UID with an app you're setting up a cloud account, known as P2P (peer to peer) which employs a server that is usually off shore. Such cloud accounts may compromise your networks security and when it's down you cannot view your cams.
With BI or any other LAN devices at your home you best network security and reliability for access away from home would be to set up a VPN, such as OpenVPN on your router...port forwarding to access those device is NOT recommended.
Things that are "easy" are generally not recommended for the aforementioned reasons but the average consumer wants that.
EDIT: I've had good luck with
Amcrest cams (rebranded Dahua) over the years and have installed and recommended them often depending on the application. I do NOT recommend any "Smart Home" cams from any vendor because of the P2P operation. To my knowledge, most non-smarthome cams from Amcrest are easily streamed to BI and VLC using RTSP.