It's not going to interfere with anything: sponsored tiles aren't going to replace any of your newtab tiles (pinned or otherwise) in an old profile.
This is simply for new users and new profiles, to populate the newtab page with useful links until all of those items would be sufficiently populated.
Or you could click the button in the top-right hand corner of the newtab page to turn the tiles off completely (it also seems to disable thumbnailing now, you had to turn that off manually a few versions back.)
This is simply for new users and new profiles, to populate the newtab page with useful links until all of those items would be sufficiently populated.
Or you could click the button in the top-right hand corner of the newtab page to turn the tiles off completely (it also seems to disable thumbnailing now, you had to turn that off manually a few versions back.)