I think it's a combination of three factors:
1. The DIKU creators realize they aren't being financially harmed (as you said).
2. The DIKU creators realize that their "license" would have a slim chance to hold up in most courts.
3. The DIKU creators realize that if a court would rule against the "license", it would open up the door for countless of other DIKUs to introduce revenue models. At the moment, they can just hope that the ambiguity will scare off most such attempts.
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