unfortunately, a lot of the userbase won't opt out. those who don't see this post, those who have posted to tumblr but don't anymore, users on older versions of the app who forget to opt out next time they're on desktop, etc. the point of making it opt-out is to take advantage of people who wouldn't have opted in but don't/can't opt out in time. automatically opting out people who have discouraged search crawling is a gesture that helps Tumblr look more kind, but from the fact that everyone else has to manually opt out, Tumblr is definitely not looking benevolent.
I wonder, will Tumblr/Automattic be selling images from deactivated blogs? I assume deactivated blogs can't opt out.
when will they start selling this data? Is it already too late to keep them from selling every image you've posted before you opted out?
and if they're especially malicious, I wonder if they could get away with saying "this image is from a blog that's opted out, but it was reblogged by a blog that hasn't opted out, so we're selling the image that's on that non-opted-out blog."
making users need to opt out to keep their images from being taken and sold is a shitty move that makes it clear Tumblr/Automattic don't respect our privacy, and @staff are really not giving us much info here to suggest otherwise.