I have checked the Mageplaza modules and found that:
Google reCaptcha requires google/recaptcha and mageplaza/module-core , see composer file I don't see they require Social login.
Let's check Social Login composer file
This social login requires mageplaza/module-google-recaptcha. If you install Social Login, it will bundle Google reCaptcha, as I can see in the description they mention to protect attack from hacker, and include that. If don't want to use reCaptcha, you can disable it in backend.
I think you installed Social Login as you don't how what you are doing.
To me, It is Not the trap.