Wtf...its on purpose??? I'm not sure if they are trying to be big brain and 4head in vn but its definitely making player felt something when we got shown "pirated" message.
That's why it's brilliant. People who didn't pirate it will assume it's some bullshit since it only shows after you got the ending for the route, but people who pirate it are left wondering if they are missing out on something.
The speech Eru gives about piracy is also kind of funny because it's her saying it. If this is really only for pirated copies they are really asking people to pirate.