There does seem to be a lot of "obvious" TM domains with mobi and it won't look very professional if a lot of companies take issue with it.
The mtld could provide a much needed service to TM holders by simply removing the domain upon a complaint and small investigation. It would only take a couple of people to search the mobi database for obvious ones. Send a letter asking for an explanation from the registered owner. No satisfactory reply and good bye domain.
Perhaps the TM holder would then be interested in acquiring the domain and attaching it to their well known business.
That would be a benefit for all legitimate mobi domain owners.
Once started, that would discourage people from continuing the practice.