I've been conversing and researching with a friend of mine, to see if it's possible at all for us to play together. If we could, then I wouldn't want a trainer at all, as I do not support MP hacking.
However, the more disappointed I become from our findings, the more it seems a trainer should be fine.
Info that I've found:
1) You can play the game Offline. In doing so, any discoveries you make will not be uploaded (basically the ability to name stuff).
www.p4rgaming.com/no-mans-sky-offline-mode-created-after-developers-got-tired-of-finding-planets-named-after-*****es/
It's an older article though.
2) You and other players have the same seed. So, if by some miracle you and a friend end up on the same planet, it will be the same seed.
-HOWEVER, anything you DO to that planet, is LOCAL ONLY. So if your friend blasts a hole straight through the planet, you will NOT see this!
3) I saw a random person post that you can shoot and kill another player, if you ever happen to run across one. This was old, and unconfirmed, and you'd have to be in Online mode anyway.
4) From an IGN video it looks like you can upload data about trade routes www.youtube.com/watch?v=BXUrOFVItgs&feature=youtu.be
With that said, I don't think you can impact them yourself, especially if you are in offline mode.
The point being, if you are in offline mode, you could essentially blow up entire planets, commit faction genocide, and deflate the economy with infinite resources to sell, and it wouldn't impact another player what-so-ever, assuming you stay Offline. Is that possible to prevent players from doing so? I don't know. And if they *do* go Online, would even that effect other players? I don't think so either, but we'll need to find out.
And of course, most importantly, if there will be any anti-cheat devices in place. If not, I'm perfectly happy to just use a personal memory reader like CoSMOS.
Edit* - A more recent article talking about offline mode and how planets are regenerated even in Online mode: www.pcgamer.com/no-mans-sky-10-burning-questions-answered/
[Edited by Draknar, 8/9/2016 7:02:38 AM]