To answer your question about 'why', Once I got beyond 2 cameras for the Synology, I have to start purchasing licenses. For 1 extra camera, it was a little over $57. That got me looking at other options, since I can see adding a couple more cameras in the future. Once I figured out how to set up text notifications, then the mobile app became a nice to have instead of a must have. I also have a samsung watch connected to my phone. Does the jpeg come through with a text msg on your watch (haven't actually tried the sms yet). With the mobile app, I don't get the image. Isn't a huge deal though since I mostly use BI to know if my dogs are barking. Security is the 2nd priority for me though, so it would be nice.
In my case, I set up what's called a reverse proxy on my network to access BI remotely. this forces a secure connection, which was a requirement for me. I also have an OpenVPN server for my house, which I could use (and I am considering). Either way, port forwarding port 81 for unsecure HTTP connections wasn't gonna happen!
I was aware of the trial extension, because technically, I had already used it, but I felt a moral need to not extend it again (since I work for a software company, I am probably biased towards fairness for the software company!!!). I had installed it a few months ago when I was originally looking for something, but since I discovered the Synology (which I already owned) worked, I never actually used BI, so they told me how to extend it.
LOL.(You ask me what time it is and I tell you how to build a watch - sorry)