From what people and the devs are saying in the forums, the DMCAs are coming from the same developer. This reddit thread seems to have more info: https://www.reddit.com/r/tycoon/comments/8dfpf4/farm_manager_2018_removed_from_steam_due_to_fake/

Both game devs do say it is a false DMCA claim. I don't think I've ever seen DMCA abuse of this kind, bring down games that compete with your own and in the case of FArmer's Dynasty the game has unavailable to purchase for almost 4 months now. There is a clear loss of income by having your game not for sale so I wonder if this is going to end in the courts. If the DMCAs are bogus then the devs at the very least can claim that they have lost sales while their game was unavailable.

It appears a game dev is DMCAing farming games here to have them off the store. Farm Manager 2018, Farmer's Dynasty and perhaps even Farm Expert 2017 have all been issued false DMCA claims and taken off the store for the time being, with Farmer's Dynasty apparently being issued 3 DMCA claims, one for each time they were brought to the store again making the game unavailable since January for purchase.

If indeed this is true then we have a game dev using DMCAs to make sure its competitors are not for sale and this is a gross abuse of DMCA, perhaps one of the worst I've ever seen. I think this warrants some investigation.