I am quite sure it wont destroy the planet. If it had that capability it would not be allowed. TPTB as well as ETs know all the facts about this science. ETs wont let our planet be destroyed. It is one area they can actually intervene in.
IIRC Steven Hawking said it could potentially destroy the universe. lol. As if there weren't countless other races out there that have done the same things in the history of the universe.
One thing I have learned is all universal mechanics are as perfect as they can be. Every single race figuring out this science would have destroyed their planet if it was capable of that... Too big of a flaw in the universe to exist IMO.