iCloud Photo Cleanup Assistant That Makes Decisions for You Instead of Showing 50,000 Decisions
Existing duplicate-photo apps (Apple's Clean Up, Smart Duplicate Finder, Clever Cleaner) make users tap through near-duplicates one at a time and people give up after 5-10 minutes. The opening is a cleanup app that defaults to 'I trust you, just delete the obvious junk' batch mode (blurry shots, screenshots older than 60 days, near-duplicates of the same scene where Photos already picked a 'best') and only surfaces the genuinely ambiguous cases for review. Less Marie Kondo, more dishwasher.
The differentiator is the undo bin and the rules engine ('delete all screenshots older than 90 days', 'keep one of each near-duplicate burst', 'flag faces I haven't tagged'). Apple won't ship this aggressively because their incentive is to keep your iCloud bill big. That's the opening.
landscape (3 existing solutions)
Every existing tool optimizes for precision (don't delete a photo the user wanted). The real ask is the opposite: aggressive recall with a 30-day undo bin, because users will trade a 0.1% false-delete rate for not having to think 50,000 times.