The exchange that you use for the future trading can be hacked
I do not think bitcoin can go below $40000 again but anything is possible
You may think to increase the leverage which might lead to money loss, that is future trading.
If OP takes a risk to trading futures, it means he is willing to lose 100 Euros for a chance at a bigger reward if he is lucky. The exchange being hacked is not a concern here.
When the bull market started, many people came up with the idea of using low leverage to avoid liquidation in futures trading. But I think this will not be effective because the fluctuations during the bull season will not be small, for example recently, after bitcoin touched 69k USD, it then decreased in price by more than 10k USD to 59k$. That shows that even if we use low leverage, there is still a risk of liquidation if the bitcoin price continues to be more volatile during the bull season.