To my understanding, not a single one of the MUDs listed are violating (nor has anybody to my understanding claimed) any codebase ToS.
IRE's games (Achaea, Aetolia, Imperian and Lusternia) run on IRE's custom Rapture engine.
Simutronics games (Dragonrealms and Gemstone IV) run to my understanding on their own custom engines. The same is true for Threshold RPG.
The only ones listed that I'm unsure of is the Avalon's, but I suspect that they too run on a custom codebase (atleast it's their claim in TMC).
This debate is somewhat equal to the "free to play versus pay-for-perks" debate, in that it is very difficult to come up with a term that everybody agrees is accurate and that is broad enough to include any serious contenders while narrow enough to keep away the ripoffs.
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