Well, Rise was locked to exclusivity to XBOX for a whole year and Shadow was released to high competition (Spiderman and Red Dead) and just wasn't very remarkable. I can't really explain the movie though (besides it being aggressively average).Rise and Shadow of The Tomb Raider have had notably lower sales than it's 2013 counterpart. Additionally, the second time the film got adapted, failed to preform well domestically in Domestic territories (even if internationally, it was able to get 3 times over it's 91 million dollar production budget).
The series is sitting at 81M copies sold though and has grossed over $4B. So, its about the size of Zelda. Heck, the 2010s was technically Tomb Raider's most successful era. Its still one of the biggest video game franchises and its the biggest video game franchise helmed by a woman. So, its nowhere near big as Mario but Tomb Raider is pretty sizeable.
But once again, It was a joke because of how easy it would be to retheme the Mummy with Tomb Raider.