It probably felt a lot less like selling out and more like making it in 2014/15 joining a MCU cast and before getting a decade of those checks from Disney. Not saying all MCU movies are bad, but there is an obvious commercialism to them downplaying the more artistic subversive and counterculture history from comics. I don’t think it would make sense to hold that against anyone though, plenty of actors and directors take on a mix of more commercial and artistic projects.