Although this option is free, there are two main problems with it.
This works by having you sign up to any affiliate marketing sites such as amazon, clickbank, commission junction, linkshare, etc. https://emiliadoka3.wixsite.com/przeprowadzka-w-nowe/post/baza-firm-jak-znale%C5%BA%C4%87-najlepsze-us%C5%82ugi