You will be able to take up to a certain amount of wls at first and you will have to pay them back by a definite time. If you dont, you get taken interests from it (up to 2%). But the more tou return your wls back in time, the more wls you will be able to lend next time. Lets say, you lend 5 wls ,and you have one week to pay it back but a minimum of 2 days, so that no bots spam these to get even more wls the whole time. If you pay, next time you get 7 wls and so on.
BUT on the other hand, if you dont pay the 5 wls back, you get an interest onto it, so that you have to pay lets say 6 wls.. and until you pay it back, you wont be able to lend any more wls until you take the debt.
This would reduce some newbies from asking for donations and also some friends from asking for wls the whole time, since they can get the wls quick to build up again. Another positive aspect would be that this would help growtopians have a plan on when to spend what, so that we have rythm, and because it isnt your wls, you have to be more careful of not getting scammed.