I do wonder about that, could it be battery operation? I know when I'm out using my GoPro on the slopes the battery will die very quickly when it's a super cold day. I blogged a while back about a possible problem of using Macs at altitude when it comes to battery swelling: http://leejo.github.io/2019/07/27/altitude_sickness/

Anyway, on the original topic here's a talk on the [mis]use of CAPTCHAs which is definitely worth your time: https://www.youtube.com/watch?v=3gKRTg-RXsc # note the first 10s or so are cut off.