Its realy truth, roloved bonus is sometimes impossible.
But is the difference roloved 6x to minimum odds 1.80 or 12x to odds 2.00
It depends on the terms and conditions of the rollover or the bonus the site is offering. You better just read the ToS so you can appraise yourself of what you need to get before you get the bonus. Usually though, the bonus will be extremely hard to get, even harder than trying to double your money with house edge on.