Story here about how AussieBB will have to increase their prices when NBNCo's free upgrade from NBN25 to NBN50 expires.
https://www.itnews.com.au/news/aussie-broadband-sets-55-floor-for-nbn-internet-charges-513504
I suspect its going to cause headaches elsewhere as well, the ACCC reports (table below) show Telstra migrated half their customers to 50 over 6 months, given free upgrade, now they have to decide if they are going to absorb the real costs, or try and undo it.
Cumulative ShareFY18Q2 FY18Q3 FY18Q4 TOTAL (all speeds) 1 Telstra Corporation Ltd 54,092 734,102 1,016,172 2,051,374 2 TPG 33,129 130,133 220,706 904,994 3 Optus Networks Pty Ltd 44,298 62,331 107,718 562,208 4 Vocus Communications 12,540 39,061 60,124 361,364 5 Aussie Broadband 0 12,944 19,684 63,413 6 Other Access Seekers 14,900 10,789 30,954 159,014 7 Total 158,959 989,360 1,455,358 4,133,321