Conversation so far:
Can you provide information on Terminology?
Stallman places great importance on the words and labels people use to talk about the world.
Was he very popular or very well known for this?
CANNOTANSWER.
What else was unique about his terminology?
He asks people to say free software and GNU/Linux, and to avoid the terms intellectual property and piracy .

Question: Why did he say that?
Self-contained rewrite: Why did Richard Stallman say to avoid the terms intellectual property and piracy?