Instead, it provides enterprise broadband service (static IP/ fixed IP), that is, enterprise private line.
Even if you can find other companies to rent broadband, it is illegal to build your own server.
And that operator restrict access to the input 80. This means that the external network cannot access your server through port 80.
Or you can only access your server through domain name+other port numbers.
Now many software can realize domain name+dynamic IP to realize 80 ports to access the external network.
Services such as peanut shells can solve this problem well.