Rotating ISPs (Internet Service Providers) can help users cross national restrictions to a certain extent, mainly based on the following reasons:

1. Dynamic allocation of IP addresses

IP address rotation mechanism: ISPs usually provide dynamic IP address allocation to their users. This means that every time a user connects to the Internet, the ISP may assign a new IP address to the user from its IP address pool. This rotation mechanism makes the user's IP address not fixed, which may bypass certain national restrictions based on IP addresses.

Geographical location attributes of IP addresses: IP addresses are often associated with geographic locations, although this association is not absolute. By rotating ISPs, users have the opportunity to obtain IP addresses in different geographic locations, which may bypass restrictions on IP addresses in specific regions.

2. Transnational services of ISPs

The existence of transnational ISPs: Some ISPs provide transnational services, which means that they can have servers and IP address resources in multiple countries or regions. When users rotate to such ISPs, they have the opportunity to obtain IP addresses from different countries, making it easier to cross national restrictions.

Choice of server location: Some ISPs allow users to choose to connect to servers in different geographic locations. By choosing a server located in the target country or region, users can obtain an IP address in that region and access content or services that are only available to users in that region.

3. Technical bypass means

Use of proxy servers: Although this is not a direct way to rotate ISPs, users can bypass national restrictions through proxy servers. Proxy servers can provide users with an IP address located in a different country, allowing users to access content or services that would otherwise be inaccessible.

Technical circumvention strategies: Some ISPs may provide or support specific technical circumvention strategies to help users bypass national restrictions. These strategies may include encrypted communications, modifying HTTP header information, using specific protocols or ports, etc.

4. Legal and policy factors

Legal differences between different countries: Different countries have different regulatory policies for Internet content and services. By rotating ISPs, users may be able to take advantage of legal differences between different countries to access content or services that are restricted in certain countries.

For example, websites in the United States can be accessed from a network in mainland China

Circumvention of data localization policies: Some countries implement data localization policies that require data to be stored and processed within their own country. By rotating to an ISP that is not restricted by these policies, users may be able to circumvent these restrictions and access and process data more freely.