How glitch text works
Unicode has “combining characters”: accents that attach to the letter before them instead of taking up their own space. Normally you get one (é = e + ◌́). Nothing in the standard stops you from stacking dozens, and text renderers dutifully pile them up and down the line. That overflow is the glitch.
Because each mark is a real character, a short word can become hundreds of characters long. Many apps cap name or bio length by characters, so heavy glitch text may get cut off.