There's a dray bomb system that sets it off if you delete the logo, but it's basically pointless because the stealer can just delete the dray bomb and the delete the logo. Theres pretty much almost no way to prevent save stealing.
I like to hide it behind things save stealers won't notice, behind the fps at the top of the save, in complicated tech. Somewhere that seems too important to delete or if using filt actually use the spare bits to write your name in binary, so that it's so much work to steal it's not even worth it.
I only do this if the save is good enough.