so the way i would have interpreted the whole 0.3% thing is that for every channel 0.3% of their viewers wouldnt see thumbnails. it seems like instead of doing that, 0.3% of users just dont see any custom thumbnails at all
unsurprisingly, not having custom thumbnails makes it quite a bit more difficult to sort through your subscriptions.
so my report on @TeamYouTube's valuable data is:
- views and revenue will decrease