How do you trust your keyword to a link building service

I confess I am a lazy dude, I simply can't persist building links myself so there's only one way left & that is to buy SEO package services from here.

But not that fast, there comes the fear of giving your keyword to an SEO service provider, what if they find your keyword interesting & decide to go after it themselves.

How do I know if my keyword is going to be safe? what do you guys look in an SEO provider before you give them your keyword?

And to all the SEO service…

How do you trust your keyword to a link building service