So you only know about him in a superficial pop culture way?
DDL says no to everything and everyone all the time, every time, all the time.
He doesn't care who it is. Kubrick could rise from the grave and he'd politely say no thanks.
When he's done doing a film, you don't know that he's gonna act again this decade. He doesn't care about money. He doesn't reprise roles or do sequels. He doesn't ever want to repeat himself. He has to be convinced that its a singular role from a singular perspective that's gonna be a unique experience for him in his process to make the film. And he's gotta have ridiculous confidence in every part of the production.
You know he's only taken 5 roles in the last 15 years? 2 he won Oscars for. 1 nominated. 1 he could've been if the movie wasn't a mess. The other was directed by his wife.
On no planet would he ever do an MCU movie, ever. That's just talking just to talk.
There's longshots like Bale or Hardy or MM or w/e, and then there's DDL.
I can do that too. They should cast 70's Burt Reynolds, and get Scorsese to direct Avengers 3.