Who has been mining any cryptocurrency and have succeded in withdrawing his money, cause I have minied so many cryptocurrency for past years and presently now, but has not have access in withdrawal.
It seems like you are referring to cloud mining here and most of them are scams. The newly developed cloud mining sites might give you some withdrawal as they need to develop some reputation to gain more customers before they scam.
So, do not try to research much about cloud mining, you will only end up losing your money and time.
Real mining is only done physically with a proper hardware setup which is not so easy to configure and also involves a lot of costs.