Probably not.

Every single card? Did you compare every single og the 500 hands to coincidence? I dont play on this site but I suppose it just has been standard/very similar spots in both sessions.
"they didn't appear to be poker moves" what do you mean by that?

To be clear, I had an old account that wasn't working to deposit; I removed the money from that account and played a fresh set of 500 hands which played the same except for a few variations, when I folded. The non poker moves were people shoving with strange hands, which could be attributed to poor players. The coincidence of being given the same hands identically across two accounts seems excruciatingly strange.

When I talked to the moderator, they said that 1 that there position was that Carbon was fair per the rules of their license agreement.

The instances were the same in whole cards and community, which meant that the error was software derived...

Perhaps Carbon believes that in a years time no one will check the hand history...

Do you think they're running some kind of preset hand settings instead of an RNG? Why would they do that?

The run of play seems more linear than randomly generated and I don't know if that is because it is easier burden for software purposes:

A) given the volume of players

and B) given that the majority of there players are located in the US so that they don't seem to have much potential further pull away from the bigger rooms.

When I was learning how to play poker I downloaded some apps on my ipad and after a while I noticed that the same hands would repeat over and over but never thought that could occur on an actual poker site