Looks good now!

Poor guys were not all bots, heh.

Good that I shared my stuff so you could take a look and spot the issue. I must be seeing it a lot but didn't realise there something wrong, I would rather assume I see thing I don't expect because of no education in non-linear filtering.

Yes, that looks more like what you'd expect. Sorry you were bitten by this bug.

Can you colour-code your maps by userid? That would be interesting.

Nope, it's just png files I download from their storage in a loop.

The only suspicious pieces for now are a huge telegram casino scam banner link obviously, and this one:

Single pixels all over the place but the change is invisible -- maybe he recompressed jpeg and bot went to fix those subtle changes.