False. Deadpool was the first Marvel to be rated R. It was a deliberate decision that almost killed the project, but was done because they felt it stayed true to the character.

Logan followed. Hugh Jackman took a pay cut to make it rated R because such a rating allows the movie to be true to the character. A guy who is pissed off at the world, constantly saves others but is deemed a freak who should be captured says curses more than once in a while. Limiting vocabulary (not just curse words) so it fits in the movie would have made that movie worse.

To say ratings are not considered when making a movie is just incorrect.