Think the point I was trying to make is that the list is outdated and needs refreshing to include some of the bigger Alt Nets.
What bigger Alt-Nets though?
As already mentioned Cityfibre do not sell direct to retail customers.
Their largest retail providers (Talktalk, Vodafone, Zen) already have their own forums.
There are currently over 100 Alt-Nets deploying FTTP in the UK.
Hyperoptic are the largest provider you mention in your OP.
The Hyperoptic sub forum only has 7 threads in the past 12 months.
OFNL and Lightspeed have relatively small coverage and a tiny userbase.
G.Network have decent coverage but a somewhat embarrassingly low 8k userbase.
Netomnia (Youfibre) and Community Fibre are the only 2 Alt-Nets making decent progress and achieving relatively decent uptake but as yet they are still very small providers.
When this "other providers" sub forum starts filling up with a decent number of posts from a particular Alt-Net would be the time to give them their own sub forum.