That being said, Vin Diesel still sent out the image to all of his followers, so he’s clearly having some fun teasing the idea that something could happen to his character.
Although, it should be said that Groot already sacrificed himself once, and it wasn’t exactly permanent.
The poster isn’t an official Marvel product.
The watermark in the upper right-hand corner of the image shows it to be the work of a digital artist with a Deviant Art page who has created an entire collection of Avengers: Infinity War inspired art, including “heroes will fall” posters for several members of the MCU.