If anything Valve is a big outlier in that regard. They've invested in many not-so-slamdunk products from Steam Link to Steam Controller, Steam Machine, Index/VR, Steam Deck (this panned out) and so on, and they kept maintaining, improving and building up good-will for each of those. You could've gotten their controller for cheaper than no-name Amazon crap, and it still works and supported by Steam.
In an alternative universe Valve is headed by literally anyone else, and one of their revenue streams is just releasing a new mtx-ridden, battle pass infested Half Life every other year and milk the IP forever.