Useless PSA: Entering and leaving a gym battle adds 1 "Battles Won" to the gym defender.
One of our local multi-accounters just found out this, and is now exploiting this to build a massive "Battles Won" count on his main gym defender Blissey, by entering the battle with evo fodder on his Mystic account and leaving immediately.
Answers
One player that I know does 3-phone Ttar/Absol raids in private lobby, with his Machamp and Hariyama armies. He does offer help to randoms (but not spoofers) who arrive late too.
The youngest multi-accounter in my area is only 12 years old! He was the one I was talking about, leaving battles to increase the battles won count.
He only uses 1 phone, but has 2 yellow and 1 blue accounts (actually he has more yellow "berry backpack" accounts). He has the same ZH/DG Blissey in both yellow accounts (which is coincidentally the same Chansey spawn where I caught my 96%), which he slots into gyms alternately.
His alt account used to be "shave protection" for his main when it was a lower level, but slowly as he maxed a Dnite and 2 Ttars on his alt (which is now L30), he starts to earn gym coins on it too.
Fun fact: He knows how to use Pokebattler. Don't underestimate 12-year-olds!
hkn, Niantic are all about money, everything they do is centered around that. One reason why i lost love of this game.
So they don't care about Multiple accounts or Spoofers, that's the bottom line. Using Multiple phones is something i never did, that's obsession and it's not how the game should be played.
I guess i'm too morally righteous for GO!