That's just a sales pitch to have companies (proactively) push their current prices to Tweakers. Where do you see anything about paid listing there?
"Om de Pricewatch actueel te houden vervallen handmatig toegevoegde prijzen na automatisch na drie dagen. Bedrijven met een Pricewatch Manager abonnement kunnen een onbeperkt aantal prijzen toevoegen."
The problem is the EU 'protecting' these commercial enterprises by fining Google 2.24b euro. A bit high and bit unfair because google at least discloses the links as sponsored unlike the sites being protected.