Why do they call them “Transformers” in the Bayverse movies?

So I just rewatched all the Bayverse movies since I haven’t really seen them since I was a kid. But I noticed something weird in all 5 movies. Why do they refer to the bots in the movies as “Transformers?” In every other iteration of the series, they are called “Cybertronians,” that’s what their species is called.

And you could say “oh, it’s because the humans don’t know what they are, so they just refer to them as transformers because that’s what they do.” And I agreed with that at first.. until Hound literally referred to his OWN SPECIES as “Transformers.” It’s so confusing! Is there a proper explanation to it? Because despite the name of the franchise being called “Transformers” I think it’s kinda weird that they call themselves it, and not by their own species name of Cybertronian.