Borrowed points have always been exactly like banked points. If you cancel, or DVC cancels a reservation made with borrowed points, those borrowed points need to be used before the end of the UY they were borrowed into, and cannot be banked into your next UY. Just like banked points.
It only turned out borrowed points have less risk in the current environment when DVC changed the rules for borrowed points and did not change them for banked points. No one could have seen that happening, so people who booked with borrowed points got lucky, they were not being more prudent.
This is my biggest beef with the whole situation. Rules are in place for a reason and now they're changing them for borrowing but not banking.
Say I have 100 June UY points expiring 5/31. Someone else borrowed 100 June UY points to use for a May 2020 vacation. Does it really matter if my 100 points are allowed to be banked to 2020 vs the original 2020 points being allowed to be put back in 2020? Both will put 100 points back into the 2020 UY. The only difference I can see is that the points going back to the original UY could potentially be banked into 2021, which could spread things out a bit more.
I don't have an issue with allowing the unborrowing of points. I have an issue with changing the borrowing rules and not the banking rules. If the rules were being enforced as they're currently written and both groups were treated the same, I wouldn't be as upset. They could have easily "frozen" all points that expired during the closure, regardless if they were banked, normal UY, or borrowed and then determine how to deal with them once they have more information. I just can't see how only allowing unborrowing at this point can be seen as a fair approach.