Hey man, kind of funny replies here and not very helpful.

I'll try to share what I know:
As far as I know, when a Proxy-provider sells a "shared" Proxy, they usually make sure that the Proxy isn't used for the same platform / website by multiple users at the same time to avoid complications.
A 4G IP will get banned as any other IP if you use too many accounts at the same time on that IP, even though it has a higher trust score. But with a 4G Proxy, you have to option to ->"rotate" the IP and get a new one. Theoretically, you could run an account for 1 hour, rotate the IP, run the next account for 1 hour, rotate the IP, and so on, all with a single 4G Proxy ...
So to answer your question: One IP is always limited to a certain number of accounts at a time, but with 4G you can change that IP in a certain time intervall and get a new one.
I'm not an Expert, but there are some very intelligent people on this forum, that maybe can give you a better answer to this!