Why can't ISPs block VPNs?

Question

VPN

With a VPN, the user has an encrypted request, so the provider cannot see the request the user is making. What then is the problem for the ISP to simply block all encrypted requests? Thus, not allowing to bypass site blocking.

Answer 1

Why can't they? They can. There just wasn't such a team yet. Google how with this in China, for example (with VPN work). Or do you think the fact that Shadowsocks is a Chinese design is a coincidence? :)
Well, besides, not every VPN is a blocking bypass. In an enterprise, this is a common technology for connecting branches with a head office and providing remote access to employees.
Suggested changing the question - removed the "Encryption" tag

Answer 2

Imagine that this happened, and the provider blocks everything that it cannot understand.
In this case, my browser will stop opening 95% of websites or so: Google, Yandex, mail.ru, Habrahabr, Pikabu, GitHub, Twitter, VK and thousands of others, because they all use the HTTPS protocol, to the content of which the provider does not have access.
Any more or less popular multiplayer games will also fall off: World of Tanks, DotA, Overwatch, WoW, etc., etc. Their traffic is also encrypted at the protocol level.
If you use an email client on your computer, the transmission of email messages most likely occurs through encrypted SMTP over TLS and IMAPS.
Now answer me, what for do I need such a provider? ..

Answer 3

What then is the problem for the ISP to simply block all encrypted requests?

This is contrary to current legislation. See laws on the provision of telecommunications services and on the provision of telematics services.
The provider can only block traffic if it clearly knows that this traffic should be blocked. Blocking everything that looks suspicious in a row is the path at the end of which you can find the revocation of a license. And if not, it's still a big bunch of problems. Therefore, the provider will comply with the letter, not the spirit.

Answer 4

VPN stands for Virtual Private Network. Without going into technical details, this is a technology that allows you to organize private closed corporate (and not only) networks using the public infrastructure of providers (including ordinary ones that distribute Internet to homes and offices). Everything now works on this technology (except the military): ATMs and communication of banks with offices, state administration, surveillance cameras, regulation of payment in the subway and parking lots, housing and communal services and the pension fund. And many many others.
Incl. we say VPN - we mean the Internet in general and all business data networks in particular.