Is Enquetevergelijk.nl fake?
No, it is not.
But does it make sense to sign up?
No, not that either.
Survey comparison is not itself a survey panel at all, but only a smart website that wants your data to then register you with the real survey sites. (Because they make money from that.)
But you can also register yourself directly there . Just take a look at the Top 10 best paid survey sites in the Netherlands / Belgium.
It's that simple.