No. Marvel & DC's origins go WAAAAAAY back to the 1930's. Not sure who the original publishers of Marvel were, but Stan Lee and Jack Kirby created more than half of the characters that Marvel has today- Captain America, the Fantastic 4, Iron Man, Spider-Man, Doctor Strange, the Black Panther, Thor, the X-Men, The Eternals, The Inhumans, Daredevil...and more.
These companies own the characters because the creators more or less sold/gave up/lost the rights to the characters. They now publish their comic through "work for hire"- which means they pay artists/writers/creators to work on their comics; the only way artists can retain some degree of ownership has been recently- Rob Liefeld gets royalties for Deadpool(because he created the visuals). Other artists probably get royalties for some of the characters they created, but his is notable, because Marvel has heavily invested in Deadpool and he's become a popular character.
The Siegel Family gets royalties from Superman, Bob Kane's Family(and recently Bill Finger's family) gets royalties from Batman, William Marston's family gets royalties from Wonder Woman...Stan Lee & Jack Kirby's families get royalties from Marvel because they created most of Marvel's characters.
They didnt succeed because of alternate universes; they succeeded because A) people were into superheroes and B) these companies created iconic characters that have withstood time; people have been reading Marvel & DC comics for more than 50 years...
There have been MANY companies that have tried, but none were successful in replicating that formula. The closest that has been is during the 90s when Image Comics formed- they started out making mainly [creator owned] superhero comics, but then changed their format to survive(they still make creator owned comics, but they have gotten away from being superhero heavy). Other notable comic companies: Dark Horse Comics, Oni Press, and Valiant Comics...within the last 10-15 years we've gotten IDW, Boom, and Dynamite Comics. There are more, but they are smaller companies.
The landscape of comics has been changing since the 90s- especially when DC's imprint line Vertigo sold books that didnt follow the classic superhero format. Also indie comics began to flourish, and by the 2000s when the mainstream industry took a [sales] hit, indie comics were able to grow...we're now at the point where indie comic creators have a better chance of making books that sell; also the market has been moving towards better sales from graphic novels & trades as opposed to smaller monthlies.
As a creator, you can do whatever you feel you want. Me, I like having control over my characters; the only move that I would possibly make is if some publishing company wanted to publish a work of mine and I got to keep my ownership of my characters, as well as printing ownership- meaning that if I decided not to roll with said company anymore, I can take my rights to my book and print it elsewhere. I've worked too hard creating stuff just to let some company upsurp the rights to my characters. I also dont have any desire anymore to want to work for Marvel or DC; that's time I can be using to work on my own material.
If you want to be the next artist on Spider-Man or Batman, then that is cool...I dont knock any of the current creators that are doing that. If you want to create characters for Marvel or DC to use, that's cool also- sometimes new characters need to be made, to propel the MC...but ultimately in the end, you will work on their characters, their comics; not everyone lucks out like Liefeld and creates a multi-million dollar character and get massive royalties from it.