Referral reward tank question

Lert: With the current referral reward tank on the line, I know many people are creating alt accounts and grinding them to tier 10 just to get the reward tank, after which they'll never play that alt account again. Or use it to sockpuppet for clan wars.   This is not only against WG TOS (only one active account allowed) but IMO also against the spirit of the referral system. It is intended to help bring more players in, not for people to create new alt accounts.   On the other hand, one might argue that this alt account grinding does serve to put population on the server for the duration of the grinding.   Should this be allowed to happen? Or should something be done about this?