I have encountered businesses requesting 100mbps Dark Fibre pricing and they are most likely looking for an e-Line (P2P) 100Mbps service utilising Fibre for the last mile.
Those that understand Dark Fibre know that fibre carriers do not limit the bandwidth of Dark Fibre.
Dark Fibre is a fibre pair provided from A point to B point. It is dedicated and not shared with anyone.
The carrier uses no electronics and the end user needs to supply its own optics to "light" the fibre.
For example if the end user puts 100Gbps optics on the end of Dark Fibre and has 100Gbps switches then the link will run at pure 100Gbps.
The moment a carrier uses electronics such as transmission equipment, switches or routers to supply a service then its not dark fibre.
Voda needed dark fibre for its base stations and TPG has undertaken to build the dark fibre for Voda's use.