there's a difference between just saving someone else's build to look at it and mess around with it, and saving someone else's build to host and tell everyone that you made it
if i spent a lot of time on a build and i hosted it publicly i don't think i'd mind if someone saved it for the purpose of looking at it more closely or messing around with it (for example: fakekilling all the bricks and driving a car into it)
but if someone else saved it and hosted it themselves without asking me, and they said that they made it and didn't credit me at all, i'd be pretty dang annoyed