I'm gonna get downvoted for this but... gaming consoles.
Gaming consoles made sense back in the day before home computing took off, and for a while they actually had superior hardware than computers when it came specifically to running games. But nowadays gaming consoles are just locked down user-hostile computers with a subscription service attached. The gaming equivalent of inkjet printers. It's an industry made irrelevant by advancements in technology, propped up by misleading marketing and artificial hype that sadly many people fall for.