There are services that provide insight of a given IP address (https://ipinfo.io/ https://ipinfo.io/) and probably is used to check client on the go. Many other

There are services that provide insight of a given IP address (https://ipinfo.io/ https://ipinfo.io/) and probably is used to check client on the go. Many other providers (Netflix, qobuz, tidal,...) have similar tech to fence off VPN users.