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Almost the entire US South is now being blocked by Pornhub
(arstechnica.com)
This is a most excellent place for technology news and articles.
No but I use a 3rd party DNS, which might have something to do with it, now that you mention it.
DNS translates a domain name "example.com" to an ip address pointing to the server. It tells your browser how to reach the server. It is unlikely the reason.
the common way to detect your location is by checking your ip address. Usually there is a database (i.e. maxmind) that keeps a record of which ip address subnet belongs to which location.
you can do a check with a reverse ip geolocation lookup tool to verify this.
so either: