Most of the sites mentioned in the article, either give cheques or vouchers as a 'cash incentive' to participate. And then it usually as certain rules regarding minimum and maximum amounts paid on effort.
It a site asks for bank details, then be a little cautious, and do some checking. And never give any details to an insecure website or email.A simple internet search usually provides sufficient information about a scheme.
The are quite a number of 100% companies, but there can also be the scam site. The more the website promises, the more you should 'think about it'.