Most of the forum participants do not even know about the existence of Forex, and the decision to trade cryptocurrency is the only solution for them. As for me, I left Forex at a time when cryptocurrency trading was not yet available there.
Yes that is the situation in the past though. I think things are changing and the awareness is increasing now with trading forex here unlike few years ago.
Anyways, in relation to what OP asked, I think both crypto and forex are risky and having same trading pattern but one thing that is challenging in forex trading is manipulation that looks more than what you observe in crypto. This manipulation is frustrating and most times comes through fundamental which is news feed that can suddenly change the trend and direction of the market. But if you are trading decentralised coins, you will hardly feel manipulation.
What do you mean by decentralised coin in your last paragraph? A coin is a coin everywhere no matter the exchange it is traded, whether centralised or decentralised it does not matter. All of them also get manipulated by whales. Crypto manipulation is worse than forex manipulation because in crypto a single person with large quantity of a coin can influence price by dumping it but that is not how it works in forex trading. You will need a big institution to be able to move the market with their orders in forex trading.