I know a lot of people have been pointing out how wild it is that a security company is getting into the crypto mining space, but not a lot of people are talking about the fee they are charging. 15% is an insanely large pool fee. All of the top Ethereum pools average around 0.5% to 1% and most mining apps charge similar fees for using their app. That means Norton is taking at least an additional 13% more Ethereum (6x as much!) from miners than what is traditionally expected.
In my opinion, this is the worst part about Norton Crypto. They are effectively ripping off their own customers by taking advantage of their lack of knowledge. There are safe ways to mine Ethereum without totally disabling your antivirus (as some other are claiming you'd need to do). With proper and tightly scoped antivirus exceptions, you can run a miner while still protecting your system. There are even services that simplify the process for you that don't require any antivirus exceptions at all.
If you're going to look at mining with your GPU, definitely consider going other routes than using your antivirus software that will take 15% of your funds.