Its not like that, let me explain you a little. For example this A company run a bounty campaign, and one of it is telegram campaign, you get stakes by joinin the telegram group, but not all in that group joining bounty campaign right ? maybe they just want to know about the project and everything. So this one cheater allready put his account inside that group but he think i can get more stakes just by put other username who in this group at bounty registration form. So just like that he cheat and abuse the campaign. Creating new telegram account require you a new phone number but creating new ethereum address as simple as flip a hand, so he create new ethereum address and just put other person telegram username in it.