Yesterday we saw some heavy accusations made by the developers of The Sinking City to the publisher nacon, which for the porting of the game on PC would have published a pirated copy of the game on Steam adding their own logo and removing that of Frogswares, the original development team, thus illegally appropriating someone else's intellectual property. In its defense, the publisher has denied all this, confirming that the copy of the game is available for purchase on the platform of Valve it is "a complete and official version of the game", but at the moment it lacks some features created specifically for the PC version such as cloud saves and trophies. In response to these unexpected developments in the legal affair between the two software houses, Steam decided to take the initiative and temporarily removed the game from its catalog.
La legal battle between Frogwares and Nacon has been going on for almost a year now, and in the meantime the matter is being handled in the legal seat in a French court, according to the developers the publisher would pirated a copy of the game illegally to publish it on Steam and make a profit without giving any kind of income to the original creators of the work. The matter really seems to be longer and heavier than expected, so Valve's decision to remove The Sinking City from its library was a more than justifiable preventative move. Furthermore, Frogwares itself seems to have notified Steam through the use of the law Digital Millennium Copyright Act (also known as DMCA), using their copyright rights to have the game removed from the platform.
In short, this question does not seem to be resolved shortly and unless a gigantic mea culpa from Nacon, The Sinking City it may not be available on PC for a long time. In the meantime, if this legal battle has sparked any kind of interest in the game, we invite you to take a look at our review of this investigative title.