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a lot of websites (such as 4chan when you post) are "detecting" VPN users and ban them from accessing the website. Their logic is "if you have nothing to hide" then you can give them your real home IP complete with your geolocation and everything.
The trouble is these detections are fairly good, since they broadly cover all datacenter IPs. It basically creates a two class system on the internet, "client IPs" that come from mobile carriers or home broadband, and datacenter IPs, that can only access servers, not websites for consumers.