If i would find 5 dollar IRL, no wallet with name and address, just the 5 dollar, then i would pick it up and keep it.
If i would find those same 5 dollar, but this time with a person nearby going in circles with his nose to the ground clearly searching for something, i would ask what he is searching for. If he then says "5 dollars" i would give it back to him cause its clearly his.
Furthermore, as Wormie and others has said before, this is a GAME, not real life. Things in a game can be made impossible by design, games usually have different sets of rules than RL as well. That doesn't mean i'm an asshole ingame, or unfair, i DO wait to see if a miner shows up, but imo it's completely fair game to take the ship myself after a couple of minutes (like with finding that 5 dollar IRL).
Lots of things in a game can't be compared with RL. Some people here say "simply because you CAN do it, doesn't mean you SHOULD do it", which is true, BUT.....
In real life i CAN go out with a rifle and kill people, but i don't.... but, i HAVE killed people in this game although its not a hobby of mine. Does that make me an unfair heartless guy without morals now? OR am i just playing by the gamerules?
In real life i CAN go out and kill all kinds of animals, but i don't... while i kill many animals in game every day. Same question... am i a heartless immoral guy now?
Finding a spaceship without a miner nearby is the same for me as finding 5 dollar IRL without it being clear who's money it is. That the ship can be claimed by anyone is a game feature. Because i believe it is spawned by a miner i think it is fair to wait a little for a miner to show up, but that is as far as it goes.
It's a game people, some rules are different than in real life. Be honest and friendly just as in real life, but if you want to apply ALL your real life ethics into this game then you cant play at all. You can't kill any people or animals anymore then, you can't participate in a landgrab anymore either (or do you go out in real life trying to conquer some-one else's land?).
Try to be honest and fair, wait a bit for the miner, but after awhile just press the damn button

It's a game feature, just like pvp or killing mobs. Really.