Isn't Umbraco the one that struggled loading a page that didn't exist, taking several seconds to load the PageNotFound page and causing very high CPU load in the meantime? Like, an issue they had for years?
Somehow I don't have great faith in that solution, but perhaps it's improved in recent years.
Eh, I have a few things from Kickstarter that were successful. Exploding Kittens is probably the most successful one of all the ones I own.