Small detail few folks seemed to notice up to this point that GameRant writes about, is our friend in our head's cyberarm was actually made by Arasaka. Which opens a lot of interesting takes on the matter from some saying he is being practical to him being a hypocrite. Here is a snip;
However, one eagle-eyed fan of the game managed to spot an interesting detail about Johnny Silverhand. Posting to r/cyberpunkgame, the user uploaded a close-up shot of Johnny Silverhand's cyber arm, showing that on the arm is the scratched-out name of Arasaka. Arasaka is one of the mega-corporations in Cyberpunk 2077 and the one Jackie and V raid in the beginning to steal the Relic that leads to Johnny Silverhand's introduction to V's consciousness. With it being scratched out, it's probably something Johnny hates to be reminded of.
In the comments, many speculate as to why he kept an Arasaka product. Ideas ranged from him being unable to afford another, the fact that it was a great piece of cyber ware, or to keep it as a reminder. Users also discussed the implications of this, with one noting that in the original tabletop role-playing game Cyberpunk 2020, Johnny Silverhand thinks his cyber arm has a mind of its own. The fact that it's from Arasaka makes this make a lot more sense.