What-spreading?

  I read that man-spreading is illegal, in NYC anyway.  What about spreading in general, as on Amtrak trains.  The seats are double, but occupied by  single individuals, who tend to spread not only their body parts, but their possessions, onto all available space.  When you board the train, which is already enroute, try walking down the aisle, and seeing seat after seat loaded with purses, ipads, phones, clothing.  The occupant is always looking down, at their devices, or else feigning sleep or infinite boredom.  The conductor advises you that you'll have to ask someone to move their stuff.  Unless maybe you're in New York City, where the word from the conductor is more like, "Move your stuff.  You've only paid for one seat."