I've been seeing about twice as many Cybertrucks as I did a year ago so I know they are getting more abundant.
There was one not too long ago I got a good look at in stopped traffic and it already had that minor thin patina of rust all over that some grades of stainless get in some types of industrial environments. Probably worked in a chemical plant.
I don't think it would rust through nearly as fast as plain steel, but it was going to need attention or it was going to get more off-color after a while.
While the actual images are linked further down, the article's lead image and video thumbnail are just of a wrap from this video: https://www.youtube.com/watch?v=PG8DRwoc47E
