Agreed. We call those people assholes. We try our best to avoid hiring those people and we weed them out of our company as fast as possible if they're discovered. We also try to have as flat a structure as possible so nobody is taking credit for anyone else's work and ideally many of us are working together so we all share the glory or frustration when something goes well or not.
I do think the flat hierarchy thing is commendable for many reasons.
That said, don't think that just because you (try to) have few bosses that there isn't some form of hierarchy in which people don't take credit for other people's work.
Sure, maybe there's no boss by title that people suck up to and take credit for stuff to look good to them. But there very definitely will be the "alphas" in the group that everyone looks up to and wants to look good to and the taking credit for stuff will be done to impress those people.
So, if you weed out this kind of stuff successfully well enough, again, I commend you. But I doubt it's as complete as you may want to think. It's just a different looking game of favours and sucking up to with less easily visible (can't just look at title to figure out who to suck up to) lines.
For some people this will be positive as they're good at figuring out who to suck up to in that situation while others may need the title to figure that out. I bet many socially awkward / socially less aware people find it easier to navigate titles they can read in an org chart than sniffing these out of the "sociosphere".
