Given some of the regexes are just like

^example.*$

And others are

^example[0-9]+$

My guess is when they have two in the list that match one regex they shorten the list by making a regex block.

So for some users I'll bet it is to take care of things like

IIIlll vs lllIII showing up and realizing that's regexa Le and hey let's just get any and all lengths of alternating Is and ls.

And then others are for like

DallasCowboys1985 vs DallasCowboys42069 where I'd bet they figured just do all DallasCowboys with numbers trailing.

Sifting through it it seems so e might be targeting one user with multiple similar accounts, but others are just totally ham-fisted dumb approaches like mine. Like I probably made the list and some other user 'foggyXYZ' also did. And now 'foggy-sux-we-hate-him' is blocked too. 👍