It may not be allowed officially, but it's definitely not policed. I've seen numerous instances of very obvious push accounts, even reported a few of them, yet every time, without exception, nothing is done. The accounts continue to operate as is, with one main account getting a huge benefit from the existence of the extra account(s). I've heard other players say the same - they see obvious push accounts, report them, but nothing is done, and the player continues to gain massive benefits.
This is unfair on those of us who play by the rules. Why are players who operate push accounts allowed to get away with it? It's obviously against the rules, but they're allowed to continue to cheat. I've given up on contacting support whenever I see such things as I know nothing will happen.