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When I'm using the internet from my ISP 'directly' (I mean with no VPN or proxy), I can surf the web freely and almost never encounter a captcha but as soon as connecting to a VPN service, captchas are all over the place.
I know that this is a side effect of using VPNs because all the traffic is originating from the same shared IP which for services like Google search engine is very much like a spam or bot traffic.
But my question is why this 'captcha abundance' is not occurring when using the internet traffic of ISP directly? If my ISP has say for example 10,000 users, they are all behind NAT and are connecting to the internet via same shared IP, then why their traffic is not considered 'spam like' like VPN scenario?
wiki
Posted 2018-06-14T06:14:20.290
Reputation: 321
Most ISP customers are NOT behind NAT, although many do have unguaranteed address assignments that may change now and then, and some newer ISPs (like cellphone networks) without enough IPv4 addresses do need to use 'Carrier Grade NAT' (CGNAT or CGN, see wikipedia). – dave_thompson_085 – 2018-06-14T06:59:03.503
1Then how many IPs should an ISP have for 10,000 users so that their individual traffic looks unique?! – wiki – 2018-06-14T07:41:41.560
ISPs have well-defined Autonomous Systems. Most VPN provides do not.
– Daniel B – 2018-06-14T08:29:52.980My guess would be that most bots are using VPNs to stay hidden from the public Internet. Some AI must have picked it up and learned to distrust connections behind a VPN – marijnr – 2018-06-14T08:55:48.557