I did a search and can't find anything about "Multiple Accounting" other than the post linked too.

I also pulled up the current ToS, and there is no match for "Multiple Accounting", "Multiple" or "Mult"..not that really means anything.

But, I'd be really curious to know:

1. What software they were using.
2. If the accounts were all in their name.
3. What were they doing with the items/gold they were farming...