Why do I have to complete a CAPTCHA?
Completing the CAPTCHA proves you are a human and gives you temporary access to the web property.
What can I do to prevent this in the future?
If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware.
If you are at an office or shared network, you can ask the network administrator to run a scan across the network looking for misconfigured or infected devices.
How will it detect taking a picture with another phone? If they're both steady, aligned reasonably well, and the resolution is good enough it's the same thing. And who doesn't have an extra phone laying around?
The app in the first link is pretty old, just so anyone knows. If there have been vulnerabilities in the last 6 years this may not have addressed them.
It came down to Wi-Fi and Bluetooth to be the wireless network standard. For a hot minute it wasn't clear who would come out the winner.
I can't find shit about it though. It was around 2000ish.