That's an artifact of the way whois information is pulled up. Basically for any domain registered you can create a third level domain and have it come up when someone searches for that domain using a command line whois utility.
What you are seeing above (and some of the examples) are the result of clueless customers who got some instruction and entered into the wrong field at their registrar. Other cases are people trying to get hits or bring attention to their site. This has been around since the mid 90's at least.
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