Let me explain Internet Infra at a Glance:

1) At National Level.
There will be a appointed wholeseller of "Bandwidth", or a group of company owing the access of country level back-bone network ( the under sea cable )



This is how Malaysian can connect to Internet. Regardless type of connection u use ( 4g,fiber, 5g )
2) Bandwitdh allocation At ISP Level ( Telco )


This explain how ISP provide their user to access internet ( regardless of connection type )
So, Example TELCO A only purchase 1TB/s daily bandwidth.
and they have 2 million user. Regardless on connection type... All Telco A's user sharing the 1TB/s bandwidth.
- Telco A can have various plan to manage EACH User Max speed limit.
3) Concurrent User
Also , the in the same Area, Depend on number of concurrent user, it also challenge the telco's switch, router capicity at that area.
So, Example:

If i using 1Gbps LAN connection to my router. Transfer from Device A to B ( i may get max speed )
But, if 12 person in same House, all 1Gbps, all use same time. Nobody getting Max Speed.
5G is just a Network Connection Technology. IT DOESNT guarantee your actual SPEED

All Telco use same 5G tower, still depend on each Telco own Bandwidth alloc, concurrent user number, and their Hardware capacity.
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Please stop the nonsense, all Telco 5G use same infra = Same 5G
Many Fiber also use TM infra, different Quality also..

I hope nobody think 5G allow them to connect to Internet DIRECTLY..
Nope. 5G only the connect to 5G tower (stop) (the rest would be cable connection from this point )
then Telco Infra, then IPX (internet exchange point), then submarine cable