Hey!
Camping is allowed and skybasing is not allowed, some people like to camp in EggWars so they can build obsidian and farm recourses. They want to defend their egg so it's a strategy. You may can use a Enderpearl or a shield to get them. I also like to play with my friends in Under Da Sea for long games, because it's always an adventure and a challange to kill campers.
In SkyWars is camping also a tactic, they are just bowing and I get it's really annoying, I also don't really like it when people camping but you advantage is they're not so strong. You also can use a shield in any mode of SkyWars and a enderpearl in Overpowerd, you also can choose the Enderman kit. It's really useful.