Yeah I probably have a number of false positives from my semi-fascist nginx configuration [2] I just use this for hobby sites and would never be accepted as a commercially supported CDN. They do fancy detection methods whereas I just use simple hacky methods. I tend to tune things so my friends can get through and some random people may get dropped until I look at what they are sending. For what it's worth each method is entirely optional or tunable to a persons needs or fever dreams. Probably language settings.
Many of the things I do are terrible ideas. That is half the reason I keep doing them.
The goal here is to show people some of the things that can be done not that they should do them. It's up to each person to experiment and determine what tickles their fancy.
[1] - https://mirror.newsdump.org/nginx/inc.d/30_generic_http_stuf...