Both are cheap tactics.
- Make it so that you can still damage people by shooting them from the back of their car (Jester, Entity, Bullet etc.)
- Tanks can only be obtained in Fort Zancudo so those with a griefing attitude will have to take their time getting there and driving back all the way if they're so determined to cause damage.
If there's anything that GTA:O Freeroam requires it's balance. At the moment, any little kid can completely overcome anyone using such methods. I remember seeing a large amount of little kids using god mode when the DNS method was used. I see too many people grief others in tanks or with hacks and the second their precious power is taken from them they either go into passive mode or leave the lobby because they refuse to play when the odds are fair.
Fair! Not being at a dis-advantage but having an equal chance of dying as your opponent which is determined by player skill. I would understand if they left if they were underpowered but no, they refuse to play when they don't have a big advantage which is just pathetic.
It's like having a running tournament and Player A has the powers of super speed, he will race every individual because he has an enormous advantage and thus will always win. But when he's going to be offered to face another person with super speed he will refuse it to no end because he has an equal chance of winning let alone facing the Flash.