My humble opinion on this:
There's a part of truth in what you say, as our community tends to be very elitist, and some players could feel excluded because of this.
However, I think you darken the picture too much.
Firstly, people are generally ok to share their rockets, I don't remember about any member refusing to share a rocket and laughing at others. Except maybe one that has a launcher 3000 km high and that he still never showed despite the fact that so much people want to see it, but that's a different story
Regarding theft, sadly it happens. But we had to react at some points because people were really pissed when their work was reposted without credits. That's understandable, and what we do is precisely to protect those who bring creativity! Also, note that reposting a rocket is not forbidden. All we ask is that credit is given to the original builder. Additionally, a rocket is only called stolen if the poster claims it explicitely as his. Reposting a rocket without claiming it as his is treated way more lightly, it generally doesn't go further than a cordial reminder.
I know thefts are annoying, but hey, blame the thieves, not us
There may be less creativity here, but we are a smaller community. Reddit recently hit the 20k members when we only hit 2k. From which a significant part of ban appealants since they are redirected here for this. But creativity is highly appreciated. Have a look at
SSA threads for example. There's not a single one that hasn't received laudatory comments.
siryonkee 's work has also been highly appreciated by everyone to give another example.