Earn money giving your product for free – The monetisation
You probably have seen that every site or app have now a cookie consent or a disclaimer in collecting data. This means that, for keeping that product free and to continue providing free content, it is using ads. What is that message for? Well, there are millions of ads, and million of users, but the space and time is limited and costs money, so for each user has to be distributed the most accurate ads.
Cookies are not software programs, are not installed and in most of the cases can be deleted in any moment that users want. Cookies are text strings that store some preferences so a user don't need to make that settings each time or to reduce the repetitive work.
In a world where the number of digital products increase everyday, and each person want to access as much as it is possible, paying for each item is not profitable. Simple ads(either as banner, video or popup) are not only inoffensive but with the purpose to be useful and to be suitable to your needs. You also have to know that normal settlement don't allow the ads to interfere too much in your user experience. Ads should never encourage at violence, promise huge earning, miraculous heal etc. My recommendation is avoid the sites that uses a “rain” of ads, that interfere with the navigation or at least you should use an antivirus.
Bloggers and vloggers already use this scheme to support their activity(that's why is the battle for followers and subscribers). My advice, if you want go at this path, first to be concern about the quality of the product and to make sure your users are content. If the main purpose is to be popular and less to deliver useful content, your failure is guaranteed. Ads are not paid the same and respecting best practices assure you a long time success.