I sympathize with the operators of these forums of course -- the UK Online Safety Act is poorly conceived.

HOWEVER.

Deleting their forums? "The act will require a vast amount of work to be done on behalf of the Forums and there is no-one left with the availability to do it." [1]

This is a false dichotomy. Put Cloudflare in front of the site, block UK traffic [2], and you're done. 5 minute job.

[1] https://forums.hexus.net/hexus-news/426608-looks-like-end-he...

[2] https://developers.cloudflare.com/waf/custom-rules/use-cases...