While you're technically not wrong, buuut a lot of games typically undergo an immediate spike in player counts at launch for maybe a week or two, then hit a dip for a few weeks as people overplay and lose interest, before player counts level out and stabilize before slowly declining over the rest of the lifetime of the game. Helldivers isn't doing that.
That said, I'm absolutely glad helldivers is doing so well and hopes it continues a steady growth for as long as possible.
Yeah this is because (if we limit the scope to multiplayer games), the gaming world is sooooooo used to basically minor niche hit or mediocre games that are not actually that fun and engaging that when an /actual/ hit comes along, everyone's brain explodes.
A decade or two ago you would actually fairly commonly have multiplayer games that were actually hits, actually had broad appeal, that had actual continuous sustained growth from actual organic recommendations.
That hasn't happened in such a long time that its now practically inconceivable.
In the last roughly 5 years, barring an occasional indie hit with actual staying power, Multiplayer games have been so lackluster, flawed, exploitative or all of those combined for so long, promoted by giant marketing campaigns and hype machines, that everyone has just gotten used to new game come out, its not that great, but NEXT GAME SOON!!!, buy, rinse, repeat.
An actually good multiplayer game with wide, broad appeal is now so nearly totally unimaginable to the basically intelligencia and managers and CEOs of the video game world that the very language of describing video game popularity has morphed to accommodate the expectation of expensive mediocre garbage that is thrown away when the next flashy bauble comes along.
The game deserves it, i just hit 50 hours on PC and am only starting to get to grinding out matts for the last of my ship modules. And I'm still enjoying it. The unpredictability of each mission keeps it fun. Can't wait to see how the game expands with time.