In contrast to other open world RPGs like Skyrim.
Kingdom Come: Deliverance launched in a blaze of very public controversy, but its core premise managed to get it to do remarkably well nonetheless, with the game selling over a million copies, and hitting a peak of 96,000 concurrent players on Steam (still the highest for any 2018 release on the platform).
Open world RPGs usually manage to retain their playerbase well over time, especially ones with strong modding scenes (which Kingdom Come also has)- sadly, it seems like that is not the case with Deliverance. Unlike The Elder Scrolls V: Skyrim and The Witcher 3: Wild Hunt, the game has lost 95% of its total playerbase since launch, currently hovering at 2,000-4,000 active players at any given time. While Deliverance is also available on other platforms, including consoles and GoG, that is also true of something like The Witcher 3, and for the PC versions, at least, the Steam version is likely to be the most popular one nonetheless.
Hopefully, there is some quality new content announced or released for the game that makes its players look into it again. Otherwise, much like so many other games, its time in the spotlight may be at an end already.