Purge AFK accounts

If you're referring to GaC, and the odd accounts at the top of the Kyber ranks, those aren't afk accounts. There's some sort of bug that has elevated non-kyber accounts to the upper tier (or they're cheaters, but that'd be quite the scandal if so many cheaters were so openly and knowingly at the top this long). Either that, or CG has filled those ranks with those accounts purposefully, to further squish people out of top rewards. Either way, they've been there awhile, and everyone else competes via all the other sincere ranks.

If you're talking about Squad/ Fleet Arena, then that's incredibly immature and selfish to request people's accounts be kicked, considering many people take breaks and return. They also won't be there forever if they never return; eventually, others in your shard will surpass their strength and knock their ranks lower and lower. So it's not a real issue. They earned those slots, they get to keep them for as long as it takes others to claim them from them. 

It's pretty messed up you want accounts kicked out just for in-activity. You didn't say cheaters, you said those who haven't been active for 6 months. If any game banned players for taking breaks, who would want to play, knowing we might want/ need a break someday, and why put in all that work if it'll be destroyed if we take a break? Rethink your gaming values and ethics, they are questionable at best.