Block should also be available on a long press from a thumbnail that brings up the little quick menu.

Just an idea... One tap block from any screen... Maybe it's a feature the user can turn on or off... .? Doesn't necessarily need to b a visible button but a location on all pics, weather zoomed in on it or in the preview windows. So like along the right out left edge, top left edge a spot for generic one tap block, middle left edge illegal one tap block... Bottom left edge another block type. My thinking is that since a user can unblock someone why not make it easier (for subscription users) to block and or report other users.