Yep :) I just find example.com easier to remember and quicker to type than any of the OS or browser makers own URLs like
- http://connectivitycheck.gstatic.com/generate_204
- http://detectportal.brave-http-only.com/
Plus, it feels nice to depend on the reserved domain name example.com instead of relying on a domain that any one specific corporation has to maintain :D
Also http://detectportal.firefox.com. And http://neverssl.com was set up for this purpose while being a bit easier to remember :)
What gives you confidence example.com won't start serving the HTTPS redirect though? There isn't any reason they wouldn't, and given that browsers are clearly tending towards showing big scary warnings to even accessing something over cleartext, I wouldn't be surprised if they flipped that switch just to avoid confusing noobs.