Green on black is ugly. It is not unreadable. Compare this to the "professionals" at YouTube, for example, who actually think medium gray is readable over light

Green on black is ugly. It is not unreadable. Compare this to the "professionals" at YouTube, for example, who actually think medium gray is readable over light gray. In any case, "I don't like these colors" is not a complaint comparable to "I literally can't read your article without being sent to an app store." As to why the design is that way, it's a visual reference to how old CRT terminals once looked.