I think that's my biggest hangup with this. There was never a "Well, we're thinking about doing this with your photos, but we were wondering if you valued the service enough to pay for it instead?"

There would have still been outrage, but people pay to get rid of ads on services all the time.. particularly if they want to continue a streamlined experience. If not, they can tolerate the ads. But using my photos as ads? If I opt-in, sure. But I don't want that by default. I'd rather see something irrelevant than have my likeness potentially supporting a business I don't want to.