One idea, how about rewarding players for gold spammer reports with some token amount of amethyst shard? I would see it as an amount of e.g. 5-10pcs per report, where of course one would only get the reward after confirming that it was spam. That would have to be technically sorted out somehow on the Amazon servers side.
However, I can imagine that after some number of reports it would ban the account automatically, or some bot can review these reports and then ban them.
It would also help a bit with the number of free slots on the server, so it seems like a win-win solution to me. People will have an incentive to report gold spammers, and Amazon can make the job of identifying them a bit easier.
I believe that most people do the reports without any rewards, but from my point of view, if I want a “better quality sample” and reward those people somehow, I get a much better tool to automate it, since then almost everyone will report it with the vision of some rewards.
Of course, there’s also some level of exploitability, so the system would have to be rethought and it’s questionable whether anyone would even want to implement it.
However, I believe that some tool involving “human power”, or ideally a combination of tools, is the most effective, machine-only control is never enough and never will be.