Like everyone else said already we don't get that spam anymore so if you fear you might stumble upon CSEM while browsing then you don't have to worry. It hasn't been an issue on 39chan since the captcha was implemented. That's not to say we don't get spam though, we sometimes get schizos from other boards disturbing the comfy nature of the site but we typically ban them within minutes or adapt our filters to automatically detect them every time they post. Raids might happen as this is an imageboard and we unfortunately live in the 2020's but we've got a shit ton of filters put in place to prevent them on top a bigger mod team, Anubis and the oekaki captcha which expires after a couple minutes so they never last too long plus usually come from a single IP/VPN service.
That being said though, I do suggest that you lurk before posting. You don't necessarily need to know about previous events, leekaloids and all that stuff, but do keep shit chill, on-topic and non-political, otherwise it's hammer time.
(quick edit: moved this thread to
>>>/meta/)