Why are many being accused of alt accounts even without enrolling multiple accounts in one campaign?
It's like a depriving of freedom preventing users from sending and receiving token outside the forum.
Where's that picture of the account farm from a few years ago? I thought I had it downloaded, but I can't find it.
OP, you've gotten good answers to your question but I'll just add this: if coins/tokens are found to be sent back and forth between bounty hunters and those accounts in turn get accused of being alts, it's because there's been so much documented abuse in bounties that it's safer (and probably more accurate) to assume it's a case of someone abusing a bounty by using multiple accounts than it is to think tokens--usually worthless--are being sent to friends, family members, or whoever.
TL;DR: History has shown that those suspicions and accusations have usually been proven correct.