Hey, I work at Cliqz. As mentioned in another thread; we have an advertising model, but it does not rely on any personal data. We have also experimented with paid products and we would love for it to be a viable option. Unfortunately, experience suggests that very few people are willing to pay (we would love to be wrong and will keep considering this possibility). So we are exploring many options; what they all have in common though is privacy by design. We do not, and do not want to collect personal data.