Forex & Stock market exchange platforms in cryptocurrency makes me feel insecure!

I'd like to draw some attentions to this topic. All comments are welcomed especially experienced views regarding the long term interference of the Giant's automation tools in cryptocurrency world.

Based on my stock market experience, automation is a pro but as we know that can be a poison for users as well. From an exchange platform owner's point of view, Automation is an easy way of collecting users data for the purpose of big data/ data mining. This will then result to manipulation of the crowd silently towards the giants maximum profit with just leaving a few percentages for some public users. Every successful investor( not just by luck) in the stock market knows the fact that is so called "Do not trade emotionally" comes mostly from this matter.

Now, the question is how a DECENTRALIZED EXCHANGE PLATFORM can prevent that of happening in cryptocurrency world? As far as I know, almost all the well-known Cryptocurrency platforms out there are centralized platforms. Considering that one of the main goals of the blockchain system is decentralization, how come millions of users are already registered in them?

In fact, is there any way that users can benefit from an automated exchange platform without being its victims down the road? Without having their data/behavior collected by the platform for further analysis and prediction models that later on can minimize the crowds profit while maximizing the Giants?

Hope this helps everyone whose concern is investing in the cryptocurrency world.