You’re saying that now, but getting the initials in “ChatGPT” in the right order took a while to learn, so I wouldn’t say it’s easy to remember, and it seems easy to stumble saying it, too?
It’s all about familiarity. Once people learn it, it’s not hard.
But it didn't matter if they were in order or not, because ChatPTG or ChatTGP all go to the same place via Google, etc. It could have been called Chat + [Any 3 characters] and been fine.
Perplexity is just a nonsensical word (for those unfamiliar with the concept) that is too long and hard to spell. They'd be better off just chopping it down to Lexity, or Lex, or Plexity, or Plex, etc.
Isn’t perplexity a normal English word? Does an average American not know what perplexity in the usual sense is? The word has a meaning outside of AI, too. Or would they only recognize „perplexed“?
It’s all about familiarity. Once people learn it, it’s not hard.