google has team that analyse traffic of channels after fact of payment
so they can deduct payment to MCN for suspicious channels with 1-2 months delay
if partner has a lot of blocked channels, there is very big probability that active channels will be blocked soon also
so there is very big risk (99%) for Quiz, that after they pay for unlinked active channels Google just deduct payment to them.
For Quiz - there is no chance to return that money from channel owners then
Google rules changed a lot from begin of June
BTW I think that unlinked channels will be blocked very soon.