People certainly try but I don't think the community gets the credit it deserves. While it is certainly true that the majority are not seasoned investors, there are plenty in there that are able to be dissenting voices to these obvious attempts and these voices are heard and do shut down the threads.
It's not easy to make up artificial reasons as you will be forced to provide evidence for your claims. You need a solid base to build your argument and you better believe that you'll be fact checked in very aggressive ways.
But you don't need an account to view WSB, you are able to go browse it right now and see that it's mostly just stock market/economic news.