The only problem is we don't know for sure it is the same person or buddies/a family/a farm, so in these latter cases they wouldn't be breaking the rule.
They might not be breaking their bounty rules, but I'm certain they're abusing the merit system. Maybe the bounty manager will care about that, maybe not. I'm also not sure how prevalent those "bounty farms" really are, though they do exist as far as I know. It seems more likely that when you have four accounts like this with sorta-similar usernames, all sending merits back and forth among them that it's a single person behind them all. If they were individuals, I'd think they wouldn't necessarily try to join the same bounty, since there are plenty of them. Nor would they have similar usernames.
I could be wrong about all of that, of course, and in the end it doesn't really matter. There's merit abuse going on and possibly cheating in a bounty--and it's all up to the BM to decide what, if any, action to take. Good catch on this one, OP.
No, I didn't inform the manager. Knowing the manager, I'm not sure that this is an argument for him being banned from participating in his company.
You might try doing it anyway, though it sucks that apparently he's the type who wouldn't care.
The posts written by these accounts are quite similar. Well, they probably all have one style, and one narrow fantasy, for inventing nicknames for their social networks.
https://twitter.com/SyedRehanZakir1
Yeah, most likely this isn't some kind of farm with multiple individuals; it's probably one person behind all four accounts.