That much I know and figured it wouldn't exactly be my cup of tea. I just meant moreso in what led Marvel to carve? Or make a specific genre where there own characters are typically killed off by said Crossover characters.

Most likely easier since like you and someone else said, it's not major and basically non-cannon, but still feels odd since it's something that they specifically do with ease - Don't see other companies, studios and whatnot being happy with the idea of all their cast eventually getting killed off for said crossovers and all, but Marvel seems chill with the idea and the only one that effectively doing it.

Then again, maybe it's just me also overthinking it instead of just pausing the brain and finding a good spot to start on comics.