Words come and go. And many, if not most, words wind up with more than one meaning, which is referred to as polysemy. When the meanings are contradictory you have a contronym. For centuries, hacker has been polysemic. Its meanings have included someone who cuts wood, coughs, stammers, breaks up land with a mattock, or plays golf poorly.
Nobody owns the word.
Nobody can force people to use it in a certain way. In a manual on writing a few years ago, Michael Enright of CBC Radio argued that journalists at the corporation have a responsibility to write clearly, using standard English. We do not follow the lead in accepting new words and phrases. Enright's words are now part of the 1999 CBC Television Style Guide as well. Being defined as a specific type of hacker in one respected dictionary is a start.