I think I would rather not have that information displayed, and wouldn’t mind an option to ‘display on profile’ or not. Hiding it with CSS is only cosmetic, so is still there to be revealed in safe mode or tweaking the rule in the inspector.
I agree with @yhh9xdq7dc that it’s a different type of information than read time/post count/like list/etc as it hints at a relationship outside of the community rather than being limited solely to information gathered from activity within the community.
For some communities it may be more sensitive than others, and an option to publicly display or not makes sense to me.