It makes sense that you ask this question.
The information on the site site is not very clear, but you must enter all personal details.
We do believe that the site is safe, but ...
... you do n't really need to register with this website !
This company itself is not a market research agency or survey site at all. They just want you to sign up to the survey sites they partner with because that's what they earn. That is why they want your data so that they can then send you advertisements for those partners.
But why not just sign up directly with the best paid survey sites ? Click on the link and you will find a Top 10 websites for both the Netherlands and Belgium, and then you can decide for yourself which one you want to participate in!