That is because they are delegating the responsibility of understanding the idea to the person they are getting the idea from. No one can be an expert in all things, but we often play the telephone game with understanding concepts. Also there can be a solid compromise where one uses a pseudonym but keeps it unchained for a long time across platforms. I’ve used the same profile pic and name for nearly 10 years. People know me yet don’t have a clue what my real name is or anything personal I’ve not chosen to share with them.