Mining how work 3 months free hosting

[Depal]

Hello, my respect!

I have question because i dont undrstand good how this work.
If i use this 3 months free hosting, i am want to use 15 TH/s, that is 525$.
The montly profit will be ~90$, in 3 months that is ~270$, that means i am in -255$ or?
Can you explain me how i will be in +, how this work? How much money i can expect from this 3 Months Free Hosting of 525$ - 15 TH/s.

All best for you!

[Depal]

And what will hapend after 3 months i must again buy 3 months free hosting or? What are those Block rewards?