Replying to Failed Brands

I've been watching old edits recently and noticed some brands that I remember quickly coming on to the scene, sponsoring a bunch of riders and then dying out just as fast. Some examples of this are:

Eira, whose gear looked like something you might find in the bargain bin at Sportchek but sponsored some pretty big names for a few years.

Causwell, who made one of my favourite collections of outerwear ever and then just, didn't release it. Apparently this happened because Eric Pollard, who designed the collection, left the team. After this Causwell quietly faded into some fly-fishing/lifestyle brand.

K2 Outerwear, probably a similar story to Causwell? Had some really nice looking gear designed by EP that seemingly never released.

Coreupt, who had huge names like Kevin Rolland, TJ Schiller, and Gus Kenworthy on the team. Even then, I never saw a single pair at a resort.

Does anyone know the story behind these brands' failures? And what are some other examples of brands like this?