“Supported” in Blizzard’s terms means it is an official game mode that is intended and supported by the Development team and by CS policies. That if something goes wrong Blizzard will fix a bug, or assist with returning gold.
Any gold transaction outside the AH, or documented trade of items and gold through the trade window, is unsupported.
- Loans of gold are unsupported
- Carries for gold are unsupported
- Power leveling for gold is unsupported
- Any loot system that is not coded into the game, is unsupported.
Player developed systems and agreements may be allowed, but they are not “supported” in that Blizzard won’t help if it goes wrong, and won’t be developing the game to consider whatever the players were doing.
This goes to the loot policy too. Blizzard does not get involved in Loot Disputes. They will investigate scams and will remove ill gotten gains, but they won’t return gold or items to the wronged party.
Here is the loot disagreement policy
Players are free to use any system they want (loot council, DKP, bid DKP, GDKP, etc.) but Blizzard is not going to step in and fix it if it goes wrong. Hence unsupported.
Here is one example of a Blue recently trying to explain Blizzard’s long standing policy on player agreed services.
A lot of things in WoW are considered “unsuported” so are at your own risk.