If you have a trademark you are legally required and compelled to go after anyone who is infringing on it. Otherwise it is deemed that you have let it lapse into the public domain.
enter debate on trademarks, patents, blah blah etc...
My point is that clearly EMI should not have been awarded a trademark on the term "entrepreneur" in the first place. However, once that trademark was granted, there was no other option but for them to start aggressively guarding it.
(and to a lesser extent EMI, if they had any decency, shouldn't have attempted to trademark it).
Don't hate the player, hate the game, etc