What are fantasy points for?

I am playing dota 2 for nearly 3 years now, but I have never figured out what the fantasy points are for and how you get them. I've seen sometimes already in replays that I have earned up to 10 (not totally sure, long time ago) fantasy points.

Can someone tell me what the usage is and how do I get them?

From this article:

In Fantasy Dota, players on a team earn Dota Fantasy Points based on the statistics they generate in actual Dota games.

It's kind of like fantasy football or baseball. There is a fantasy Dota feature. You can earn points whenever one of these players participate in a tournament.

From the Wiki, it also states that you can win in game rewards for participating in fantasy Dota. A scoring section is also there for reference on how the points are actually calculated. They are:

• Kill = 0.3
• Death = -0.3
• Assist = 0.15
• Last Hit = 0.003
• Gold per minute = 0.002
• EXP per minute = 0.002
• Seconds of enemy stuns = 0.07
• Every 1000 allied healing done = 0.4
• Tower Kill = 1
• Roshan Kill = 1
• First blood = 3