How could anyone not know they are too large for such attractions?
Different rides have different size seats. You may fit on some but not others. I am 6’2” 220 lbs and some rides push down on my shoulders very uncomfortably.
At Universal Hollywood, for the Harry Potter rides, there is a test seat at the front of the ride, so you can see if you fit inside and make sure you can fasten up, before you wait in the long line for the roller coaster.
I know of a guy that sued an amusement park because of embarrassment trying to fit in a roller coaster to no avail. Truly.
I’m too “large” for some attractions. It’s not that the I don’t fit in the seat, its the locking/safety bars/devices are not designed for larger people.
Here’s a clue. When your back end hangs off the scooter you’re riding ‘cause you’re too FAT to walk the theme park! Just an idea.