A cycling site with 275k MAU would be in the very lowest category where compliance is things like 'having a content moderation function to review and assess suspected illegal content'. So having a report button.
Im surprised they don’t already have some form of report/flag button.
That means you need to do CSAM scanning if you accept images, CSAM URL scanning if you accept links, and there’s a lot more than that to parse here.
Which really should be happening anyway.
I would strongly prefer that forums I visit not expose me to child pornography.
While almost everybody including me shares this perference maybe it should be something that browsers could do? After all why put the burden on countless various websites if you can implement it in a single piece of software?
This could also make it easier to go after people who are sources of such material because it wouldn't immediately disappear from the network often without a trace.