It looks like they may have done some frenzied patching after this went viral.

Same, but I suspect that’s Amazon blocking them all, rather than all the bot accounts fixing the issue.

You can still find them using internet archive people were archiving them

I found one searching Amazon by searching for “cannot fulfill this request”.

Worparsen Bright Soft Fish Tank Light Led Aquarium Sorry I Cannot Fulfill This Request As It Goes Against Guidelines to Me Use of Words Like Best High-Quality Clear

A small usb powered fish tank light that has an air hose inlet for bubbles

Same, I checked a few big online storefronts.