Which is what I said. IF I wasn't willing to do the work, I wouldn't set up a campaign where the work was necessary. It is easy to set up a campaign, even in the Marches, that will never go anywhere near Foreven. If I set up a campaign that is on the edge of Foreven, I'm committing to developing Foreven.
On the other hand, if the players say "well, we are going to leave the map because we can" after being made aware that I don't have the time to develop that area, they are being jerks. Because obviously, I'm not creating plot threads or other hooks that lead into areas that I'm not intending to develop. That is intentionally disrespecting my contribution to the game and my free time.
As for the you do you/I do me thing, you are asking Mongoose to create work product covering the reserved area instead of developing content elsehwere, that is in demand and not reserved. Like Gvurrdon & Antares. Once that material exists and is supported, it automatically erodes the Reserve status others are relying on.
That's why the previous semi-official Foreven stuff was never adopted by Far Future Enterprises, unlike many other 3rd party and fanzine originated sectors.