The VPNs service providers also know this and have introduced a feature called Stealthing, Ghosting or VPN Obfuscation (terminology varies, but they generally mean the same thing).
Abahlinzeki bemisebenzi ye-VPN bayazi futhi baqalise isici esibizwa nge-Stealthing, Ghosting noma i-VPN Obfuscation (igama lamagama liyahluka, kodwa ngokuvamile lisho into efanayo).