You can't use restricted shares for closing deals or collateral.
"Restricted stock units (RSU) are stock-based compensation awarded to employees. As noted above, the RSU will vest over a predetermined amount of time, at which point you can access the stock to do as you wish."
Restricted stocks are used for bonuses or to reward employees. Somebody got a nice bonus.
Then there is still the vesting timeline. Thats when you actually get the shares. Restricted shares given to employees have a date when they can be sold. They are also considered to be income so you pay taxes on them.