I can assure you it's not about traffic. If it was then the WISP reselling on their FTTH lines on the Afrihost network would have been kicked a long time ago considering they do a few Petabytes on the lines in a month.
Hosting servers, reselling or making money out of a FTTH line is against the...
So I assume you are moving to a dedicated FTTB line right because these terms are mainly from the FNO side and are applicable to FTTH lines.
They are not enforced but some FNO's do site visits on high traffic FTTH lines to check if the line is being resold or used for commercial purposes.
I'm convinced they don't have capacity in JHB and I questioned them and called them out on it and they just stopped responding.
Even with 200G pni they drain the traffic on the PNI and send it to EU.