I've also had a chat with someone who apparently has more methods to crash a server running gProtect, they tried the methods with GMToolbox to no result. I don't know of their methods and how they work, so they're not really explicitely mentioned anywhere to my knowledge.
You're right about the out of bounds detections, I did indeed notice it wasn't every tick, I forgot that I had mentioned it here so never updated my comment.
Sure, it's not intensive to loop over all entities in the map every 120 seconds, but if you combine that with all the other addons, it really does add up. I myself wanted to implement this feature in the exact same way you did, but I ended up using a different method.
The automatic prop restrictions isn't meant to be better than other prop protections, I am aware that gProtect does this too. It's just to make sure people know it's a thing. And technically, with GMTooblox, you could allow all props to be spawned, and there still wouldn't be a crash exploit. Doing so would allow players to briefly cause lag, so it's definitely not recommended.


