NBN complaining that ISPs move users around speed tiers too often

NBN is having a sook that ISPs who put users on higher speed tiers for free as a promotion to incentivise them to pay more for faster internet, something NBN has been pushing ISPs to do, are creating problems with their demand planning and revenue projections. Because users "yo-to between tiers" (i.e: 50 to 100) whenever an ISP starts and ends a promotion, NBN is "unable to distinguish why customers are moving up to higher tiers - whether the move is genuine, and the customer is paying more for a faster service; or whether the move is algorithmic, temporary and comes with only marginal extra revenue for NBN Co". How about dropping the goddamn speed tiers and allowing Australians to use the damn network to its maximum capabilities? That'll fix the problem.