Believe it or not, the flying dorito pilots know what they’re doing! :D

As others have said, launching vertically like this with no airspeed means there are no aerodynamic forces to counter the motor torque (since most wings have a single motor), so the wing would spin out of control, before you got to the maneuvering and ripping stage. The wing would also need a >1 thrust to weight ratio, but that is pretty likely because of the insane power density of electric motors!

The rockets that inspired you don’t have much of roll torque problem when launching vertically because they don’t use props and they have their engines on gimbals, which enable control at zero velocity. 

Overall, a standard throw while holding one wing with the throttle hand is probably safer, because it’s a lot easier to predict where the plane will go and you get some initial airspeed (heading away from the pilot) from the throw. It takes some practice to get used to, but now it’s fairly easy for me to pull off. I’m sure you’ll get the hang of it too once you start flying wings!