Have you considered handing off the forums to someone based outside of the UK? I'm sure you might be able to find a reasonable steward and divest without leaving your users stranded. You've worked very hard and have something to be proud of, I would hate to see it go.
There’s several stories of open source projects being handed off to someone who seemed helpful, only to have them turn around and add malware months later.
I completely understand a desire to shut things down cleanly, rather than risk something you watched over for years become something terrible.
"The Act applies to services even if the companies providing them are outside the UK should they have links to the UK. This includes if the service has a significant number of UK users"
This is gonna sound crazy, but you can potentially just ignore unjust laws in countries like the UK if you don't live there. At your own risk of course, but that is the nature of protest. If OP divests completely then it should be out of his hands.
The OP does live in the UK. It would be insane to uproot their life just to keep a forum alive, while still having to deal with potential headaches related to it.
> The subsection headed ‘User numbers’ (which begins at paragraph 5.7) explains when a
service is to be treated as having more than a particular number of monthly active United
Kingdom users for those measures which apply in relation to services of a certain size, and
how to calculate the number of monthly active United Kingdom users. The definition of
‘large service’ is included in the definitions section in Section 5 of this document.
That section details how to calculate the figures, because they're relevant for sections like CSAM scanning
> Services that are at
high risk of imagebased CSAM and (a)
have more than
700,000 monthly
active United
Kingdom users or (b)
are file-storage and
file-sharing services.