I like spelling "**** You" in weapons and then putting a box over it. Then I get on my extra account and call out the asshole's that try to steal my map. & this is off topic but on my racemaps if I have enough money afterwards I like to have the teleporter's at the finish line (anti-cheat stuff) take you to a room with "***" spelled with rockets ahah lol.
I believe Bungie can easily make a finally save option. The finally save option will save your map and won't let you change the description, map name, or creator name. About the infinite budget glitch maps, I think that you should tough it up and create your own. And like Pope said I think should also have an option editable/uneditable.
An editable/uneditable option IMO would be the best, I think. Some forge maps are supposed to be used to forge on. (Budget Glitch, Canvas, ect.)
It can not be fully stoped but if you make your map well known then people will have a harder time copying it.
The only real way to keep someone from stealing your map is publicity. If you make it known that a certain map is yours as soon as you create it, then you'll always have a reference point to go back to when disputes arise. You'll have concrete proof when someone attempts to get away with it. Also, it's great to put "Made by: Your Name" in the description, because when someone tries to change that, it changes the date too.