Ah.
If Arasaka is your bogeyman past your first dozen or so games, maybe less, you're Doing It Wrong.
Why is Arasaka the bogeyman? Because they are ruthless, fearsome, driven and fully consumed by their own agenda.
How are they different from the other megacorps and would-be megacorps? Really only in presentation.
They are -obvious- about it. Boys in Black. Security in places Edgerunners shouldn't be. Japanese. Etc.
If your players haven't noticed that every other Corp in 2020 is -also- like this, (some even worse), then they've missed a fundamental Truth of Cyberpunk.
Don't you remember that first time in your first cyberpunk campaign where you found out our employers were actually the bad guys? That the people you worked for were as bad or worse than the people you'd just survived fighting? Wasn't that a great feeling?
Until not too long after, you were working for Arasaka and thought nothing of it. Made sense, why not?
At least until your player started fresh characters who hadn't clued in yet - or even better, some hyper-rare principled character like a Cop, Nomad or Medtech who refused to compromise their principles. Those are the best kind to ruin.
This illustrates partly why I'd like to get some new players playing with us. They have such sights to see.