I think the stocks exchange are not great scams since the government has a strictly compliance in that particular transactions because it was supported duly by the documents that can helps to protect the investors.
I agree, though we are into cryptocurrency, it doesn't mean that we need to tell others that stock exchanges are a scam, governments already made a way on how we can be protected from insider trading since it is a foreseeable crisis that comlanies might take advantage of, just like in cryptocurrency, there are exchanges that are tsking advantage of our profits, and some coins are also manipulating their volume, in order tonattract new investors, but that is the risk that we had to deal with, since cryptocurrency is relatively new.