I don't believe it is feasible to run an image hosting service with your intended CSAM management plan. Based on this comment thread, I fully expect your site

I don't believe it is feasible to run an image hosting service with your intended CSAM management plan. Based on this comment thread, I fully expect your site will soon host CP/CSAM, if it doesn't already. Other image hosting services devote extensive resources to engineering a solution to this problem (one that is more robust than user reporting). I would not expect you will be able to avoid this work, and avoid liability. Edit: I just noticed you're quite young. Congrats on all the great work. I think this CSAM thing could bring misery your way so I hope you find this comment helpful. Good luck out there.