All BuildBot does is make it so that saves are like macros, the way I see it.
What if someone made a macro of a default save?
You'd be mad then, too, if this makes you mad.
I see no reason to dislike this, there's even a mod to prevent it and some default things.
Ban the player using them and clear their bricks if you don't like it.
If it isn't your server and you can't do anything about it, leave or ignore them. Report them to an admin.
Whatever.