Because if you can transfer assets in game, you can sell them on the internet. There is no way to stop it from happening once you allow assets to be transferred.
So ... should Frontier be removing Fleet Carriers (which allow credit transfer at billions of credits per minute with the right cargo loads) or at least heavily restricting their use?
"Credit transfer will lead to an epidemic of real money offers" was a common forum refrain up until about 2020. Then Fleet Carriers came along, made it pretty straightforward to do (
much more so than the previous dropping of valuable cargo for others to scoop) while simultaneously creating a significant demand for credits in larger volumes than before ... and there may or may not have been an increase in people offering trades of that sort but it wasn't large enough for the forums of 2020 or 2025 to be repeatedly decrying it, calling for Frontier to restrict FC commodity pricing to make it impossible, etc. (indeed FC pricing ranges were extended from 10x to 100x by popular demand not all that long ago).
We've been able to (clunkily) trade Odyssey engineering materials since Alpha 1, and much more easily do so since the FC Bartender service was introduced in early 2022. Again, if there has been massive "£10 for 10 Manufacturing Instructions!" stuff going on ... it's hardly risen to a level where the forums have noticed or where Frontier have had to take action against it beyond quietly banning those involved. And again, the relatively recent FC pricing range increase to allow players to make in-game credits-for-materials trades at a price reasonably reflecting the difficulty in acquiring the materials doesn't appear to have been at all controversial.
Now, sure,
maybe it would be different for the in-game transfer of ship engineering materials or (as a further shortcut) the final engineered modules. Maybe that would be a problem when the others apparently haven't been. But if it is, it has to be for a reason that applies to those and
doesn't apply (or doesn't apply strongly enough) to credits or Odyssey materials, not merely "well, people
could in theory do this, ergo they obviously
will at a level which will cause a noticeable problem".
(None of this, of course, stops there being
other reasons unrelated to the potential for real-money trading which mean that Frontier doesn't want to allow inter-player trade in ship engineering materials either directly or indirectly. They might not want to allow someone for no recompense at all to give their spare materials to an in-game friend. It might even be as simple as having fifty other things they feel are a higher priority for their UI team.)