Trovit doesn’t (and will never) ask for any kind of payment for you to access our information.
However, and since we work as a search engine and our goal is to show you all the ads, every now and then some of our results might direct you to a website that works with a paid subscription model. These websites are not a part of Trovit and the way they show their ads are not under control.
Our mission is to offer you every single listing available. The vast majority of websites with ads on Trovit are for free, but if you find a paid one it's your call whether you set up a subscription with them or not.