its better to if we invest in mining site or gambling
You can invest in "mining" site but it seems that such sites are closed sometimes and users lose their money.
You cannot be sure if mining site is not a hyip.
I'm a little confused by this wording. Are you part of this site? It seems like you're saying "I don't know if I'd invest in the mining part of the site, because sometimes those kinds of things get shut down and people lose their money." If you work for this site, I don't know why you'd be saying that, or maybe I'm reading it wrong.