talk about threat model for vpn usage (YunoHost#2452)

* talk about threat model for vpn usage

* Update pages/02.administer/55.providers/15.vpn/vpn.md

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Co-authored-by: Alexandre Aubin <4533074+alexAubin@users.noreply.github.com>

Author: OniriCorpe

pages/02.administer/55.providers/15.vpn/vpn.md

@@ -14,6 +14,10 @@ routes:
 
 Since setting up a server at home is an uncommon practice, most Internet connections provided to individuals are unsuitable for this purpose especially if you desire to send mail. A net neutral VPN providing a dedicated fixed public IPv4 address and IPv6 addresses [can help to circumvent some limitations or difficulties](/vpn_advantage).
 
+! Note that except if you have a <a href="https://en.wikipedia.org/wiki/Threat_model">threat model</a> that implies to really be "hidden", you do not need to hide your home IP address using a VPN. It is really not a huge deal to expose your IP address, do not trust the big commercial VPN companies who tries to sell you a product by inducing fear.
+! If you *do* have such a threat model, especially against state threats, most of the providers listed below will **not** be of any help to you, since they will have to comply with police and judicial demands.
+! However, a VPN can help you to bypass port-forwarding limitations, or to get a stable IP address (if you ISP only provide dynamic IP) and this page will help you for that!
+
 Below, you can find a list of providers compatible for self-hosting and especially those providing .cube format for VPNClient apps and those providing [internetcube](https://internetcu.be).
 
 !!! By **compatible for self-hosting** we means VPN offers with at least: