meaning 1 address only can register 1 fiber only?

SG Broadband penetration rate is already over 90%, IPS have to find a way to sell more broadband 

And actually no point to have same broadband service in a same premises, when it is down time both also down. You can apply 2 different ISP in a same premises in fact.
example Unifi + TIME

Forget about Maxis, because most of the time Maxis are using Unifi infra, unless Maxis do have their own infra in your area.

thats new, last year I using my friend house and register maxis, then bridge the LAN 2 via Wireless

Actually 5G and fibre broadband investments don't clash with each other. Both of them cater for different array of consumers.
For example, are we going to use 5G as the corporate office backbone network where thousands are connecting to the same network concurrently?
Are we going to expect 5G to cover the connectivity that needs extremely low latency like the banking network system or online gaming?
5G experiments of data rates varies greatly across different countries. 

5G afaik is a much better version of WIFI than current 4G with much wider coverage. And that is all to it. Also, the adoption will mean that new equipment like new phones or devices are needed to connect to 5G network.

The ISP that solely relies on 3/4/5G alone are doomed to saturate themselves with smaller and smaller pie for themselves. 

Personally I prefer the fixed-line fibre broadband for stability and always-on connectivity.

Yes that's why I mentioned earlier they acted in silos. The fiberisation efforts are minimal and limited in scope as compared to our wide area of land mass and population.
That's the reason they still receive complaints after complaints from home fibre broadband customers because these telcos still rely on TM infrastructure.

And that's more of the justification to form a consortium among themselves to compete against TM together with TIME and TNB Allo.

during transition period also cannot?

for example if i want to terminate unifi and sign up celcom, cannot have celcom connected before i terminated unifi? like that will have downtime rite?

worst case if one's area has fibre ports full, during the transition if terminate unifi first, the port maybe taken by others rite?

I see. Thanks.

For DiGi, needs to go to DiGi store to do rite?

Same for celcom?

It's the Malaysian government's fault to allow TM to monopolize the wholesale fibre infra in Malaysia by subsidizing them with their RM10B HSBB buildout.

At the same time, they allowed TM to operate their own consumer RSP UniFi brand to compete with other players on the HSBB.

This open access structure and idea is a total FAILURE to begin with as it allows the wholesale operator to favor its own ISP brand and dictate others with its pricing structure/implementation.