Is possible win big prize in slot machines?

there are many slots games and providers ,in most of them can not win.

For example i playing slot starburst, i had 100 free spins and nothing.

then I played others slots and after several spins have win.

They are some slots win and some never win?

I find this website: https://slot-machines-how-to-win.000webhostapp.com/

Its scam?