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Are the loot drops shared (as in D2, you better grab fast) or is it like D3, private for each player?
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Who gets credit for special monsters (e.g. quest targets and mini-bosses)?: The first guy to tag (hit him), everyone who hits him, or just the guy who kills him?
As others have pointed out, there are a lot of bots in the game already, but aside from that, I have run into players who were camping spawns, too. So it would be helpful to know what my chances are to enjoy drops and progress in the game under certain conditions.
I don’t know about xp from kills. But the xp orbs are totally yours
As far as campers, I usually see this on certain bounties.
I think You can leach things like lacuni hide drops.
That is how it is supposed to work, but I keep seeing greyed out monsters where you hitting them dont count for anything. Same thing happens in WoW as far as I recall . But not sure what causes it in D:I.
Also, tbh, the idea that monsters are shared is good, obviously, but when we basically oneshot the monsters, it is not particularly useful 
Lost Ark has the same issue there.
D:Immoral has 12 different currencies to buy and spend.
And that is a good thing. Also there are all tools in place to do conversions between all kinds of currencies (just like in K-Cube) in case when disbalances are created.
nah, it’s a scam to add illusion to actual cost of the items.