A person managing multiple accounts at the same time and farming reputation and merits on all of them is something I will never be able to understand, either this person has a lot of free time, or it is some kind of compulsion... Even if you can make money on campaigns with multiple accounts, wouldn't it be easier to use this free time to simply work? It would certainly make a lot more money than farming accounts to cheat the system.
Anyway, as JollyGood mentioned, he may live in a poor place, but there are other ways to make money with the internet, it has no borders (in most countries) you can very well create content, sell things... infinite possibilities.
Check how much time owners of hundreds of accounts spend participating in Bounty, a place where there is a risk of not earning anything at all. If these people spend a day on bounty, then why won't others, who can pretend to be different personalities, participate in several signature companies? To be fair, this is better than bounty. Although I do not justify either one or the other, sometimes the poverty of life, not always greed, forces people to sit from morning to evening in front of the monitor. We can only sympathize with them and advise them not to try to deceive more than they have already deceived. On the other hand, alternative accounts are allowed, and I simply do not see any other use than several accounts from one owner to increase profits. Very few people use alternatives in other honest cases. But I agree that to be yourself and use the forum as a person and not as a bot, one account is enough.