What is 123myIT and is it safe?

Came across this website five seconds ago while searching youtube on ways to download videos and watch them offline for future entertainment, being the cautious individual that I am, I shut down the site immediately on my pc thinking it's has virus, and reopened it on my Samsung tab and proceed to start... show more Came across this website five seconds ago while searching youtube on ways to download videos and watch them offline for future entertainment, being the cautious individual that I am, I shut down the site immediately on my pc thinking it's has virus, and reopened it on my Samsung tab and proceed to start reading, ...... HOME, IPHONE, ANDROID, MAC etc, what does this website do, can someone explain in details what it's purpose is.

P.S. Looks complicated.
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