I saw a YouTube video of someone using this site - https://www.genesis-mining.com

Then I thought it looked easy and fun. But I have never heard of this Cloud Mining, thing.
I know of big supercomputers to thousands and thousands of dollars, for mining cryptocurrency.
Or a very slow and "useless" process on your own laptop computer.

Is this legit? Is it worth it? Anyone here with a Genesis or any other similiar provider experience?

Pros and cons, etc... ?