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Quite obviously because the vast majority of MUDs nowadays are DIKUratives of one brand or another, while there are just a handful or two of other major code family MUDs left.
And on the specific matter of LP, this is additionally due to the fact that there are LP implementations which do allow commercial usage. Which has tremendously helped clear matters, as those who wish to make a profit have means and ways to do so without recoding a full MUD from scratch.
Finally, because the actually only instance of alleged license violation in the LP world I'm aware of (not that I have exhaustive knowledge, mind you) has supposedly been resolved between the copyright holder and the alleged violator, and no credible evidence to the contrary has ever surfaced - Something quite different from the DIKU situation where the copyright holders have, in the past, and on several occasions, spoken out clearly against certain types of violators.
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