you know, they should probably just release their own ports. maybe on a susbscription service.
Monetize it and most people won't pirate their old shit. A lot of people only start pirating stuff because they want to play old games that aren't sold anymore.
there's plenty of switch games that are now out of print and hard to find. any game that was only ever sold digitally won't be findable once they take it off the marketplace. And yes, the do take old games off their marketplace.