the faucet and the limit on the faucet differ from site to site
some new sites give out big amounts of money with their free faucets to attract players
there is a very low chance for a player to start depositing to a new casino without trying it out first
on the other hand ,Primedice is an established site with a huge player base
so if they see that the amount of money they give away through their free faucet doesn't serve its initial purpose of attracting new players
they may as well cut it down
What if someone is trying to Bank his balance to his alt account i have seen many people doing this on pd .
Even i did that in past and Mods says there's nothing wrong with it if you are not abusing faucet.
This. Me and many others have done this, especially when using bots to gamble. Restricting withdrawals that way would do no good.
They should just make a bank-function. So you can have two balances, a play balance and a bank balance. So if you are autobetting, it wont eat your bank-balance on a big red streak.

Well I am pretty sure they don't have this feature for a few reasons.
Some can be that they hope that you set the autobet on and leave and don't notice it wipe out your balance.
Another reason is they hope instead of clicking "2X" and hope you accidently click on "MAX" by accident and drain your entire balance in one roll.
I think most people just deposit a small portion that they are comfortable losing instead.