God damnit, why can't you get this right? For the love of god please contact void-san on https://umigalaxy.com/
Maybe he can help you get it right. The SSIM of the webp uploaded must generate a value of 1.0 in order to avoid generational loss, webp is DOGSHIT AT GENERATIONAL lOSS.

ffmpeg -i 14269a4ea6f5e0077af477a22d6dd73d8616ee2c601a0309b88cc63a4d9fe354.webp -i psnr-44.webp -lavfi ssim -f null -

SSIM
Y:0.999462 (32.695007)
U:0.994209 (22.372163)
V:0.993693 (22.001960)

All:0.997625 (26.243752)

Also consider making a separate AI containment board for all the AI spam, we're currently talking about that on https://boards.4chan.org/g/thread/109407325 where your site was mentioned.
The internet as we know it might be ending in a few years but I think we should at least go down fighting all this fucking shit IMHO.