One of the fastest ways to grow a community.
Action for link creates a page which locks a target link. To unlock the link, the page viewer must first click on the buttons. Each button has text which contains your specified request. You're basically asking page viewers to commit an action before allowing them to get your link. For example, in order to get your free download link, they must first like your specified YouTube video.
The server remembers for a period of time if someone has completed a step. So if someone has completed the "Subscribe to my YouTube channel" step from another page, they won't be asked again.
If a user has already completed all steps prior to opening your page, the page will act as a link shortener. It will simply skip straight to the target link.
Its not recommended to put your viewers at an inconvenience. Try to keep your step count at a maximum of two even though you're limited to six.