@simon this sounds a bit like there is a need for a good open platform to integrate that handle these things appropriately. A discourse but ran in a sourcehut / lobster, etc style.
Alternatively , detect geoip and no commenting for EU users while everyone else can.
@dsp the UK has ratified GDPR though. A British website administrator is a data controller. GDPR clearly states in the very beginning of the document that its scope is protection of the rights of natural persons worldwide, and a push-back against the global data misuse.