NeoGAFs Kent Brockman
A recent patch to the Tomb Raider reboot games suggests that the series could be making its way to Epic Games Store in the future
An update for was released on October 18 for both Rise of the Tomb Raider and Shadow of the Tomb Raider, with it adding Nvidia's DLSS support to the games, as well as improving ray-tracing capabilities and fixing compatibility issues with Intel GPU hardware. However, one part of the update stands out from the rest: "Updates to multiplayer infrastructure to use Epic Online Services."
It is possible that the game's developer Eidos is just making use of the services that Epic Games offer, but it is worth noting that the publisher of the series, Square Enix, recently began a partnership with Epic Games to bring some of their games to PC.