Uhhhhh... Technically CubeCraft stole the Eggwars idea from a German server.. So.. It's not like Eggwars was an original idea from CubeCraft. So Hypixel could've ''borrowed'' the idea from either CubeCraft or the German server. If I remember correctly, the German server's Bedwars was based off of game that already existed. They just made it into Minecraft.
But besides that, no.
CubeCraft doesn't really need new games imo. I'd love to see some of the old games return like the Parkour Minigame (Which is, before anyone quotes me saying this is already a thing, not the same as normal parkour.), Hour Glass and Super Craft Bros.
So I can't really see any new games being added.
Besides that, as you said, it sounds wrong.. They can't just go look around stealing other server's idea. Because that's basically what you're suggesting. It's not borrowing, it's stealing. Yeah, it's insanely hard to get an original idea now-a-days. That doesn't mean CubeCraft can just go steal Hypixel, or any other server for that matter, their ideas.
If you want new games, you should suggest that CubeCraft should add new games, and what kind of games, how the game works etc. etc.
''So I was thinking, not out of spite or revenge or anything like that, but just borrow some of their game ideas.''
How is this not out of spite or revenge? You mentioned twice that Hypixel ''stole the concept of Eggwars'' and then you go on and say that because of that, they should steal Hypixel their game ideas...
Please.. Please, please, please. I'm begging you, explain to me how this is not out of spite or revenge then?
If you would've said ''I'd love to see some new games, maybe CubeCraft can add some? Perhaps their own take on Murder Mystery or The Walls.'' (Yes, I know CubeCraft used to have a game that looked like the walls, it's just an example.). That would've sounded like you genuinely wanted new games. Now it 100% sounds you want CubeCraft to take revenge on Hypixel for stealing a game, that CubeCraft themselves stole in the first place..
Another thing: You suggested them adding Hide and Seek.. Because.. it ''seems to be popular..'' As I'm writing this, it has 96 players.. For CubeCraft, that's quite a lot.. For Hypixel that means it's quite dead. Games like Zombies and Party Games have twice as much players.
Or you know... Skyblock with 24k players..
But that has been suggested before, and people hated the idea.
So then you could look at something like Build Battle or Murder Mystery, minigames, that have a lot of players..
Hide and Seek is not popular..
I know it has nothing to do with the suggestion but it just really bothered me.
Anyway, no, this is a bad idea.