This is not italics. This is not even oblique. This is a side effect of how those displays work. Instead of a whole rectangle of pixels being changed at once, the display is updated line by line, starting from the top one. As it’s moving towards the bottom, the internal horizontal position might have already advanced, the subsequent lines will be drawn slightly to the left, and it all leads to a slanted appearance. (This is in effect the same problem as rolling shutter in photography.)
The interesting thing is that it could’ve gone the other way. Twice. In English or German, we treat scrolling left to be natural, and we consider only one direction of italic slant appropriate. The first has to do with the direction of reading. I believe the second is, like many things in typography, customary; there’s nothing inherently better than right-leaning letters, except we’re used to them since those are the only ones we ever see.
