I'm not a lawyer but this could very well be illegal under EU and UK law, and I hope the website admins and owners have considered this, since the site is accessible from Europe
https://ec.europa.eu/info/law/law-topic/data-protection/reform/rights-citizens/my-rights/can-i-ask-company-delete-my-personal-data_en
https://gdpr-info.eu/art-17-gdpr/
https://gdpr-info.eu/art-6-gdpr/
https://gdpr-info.eu/art-9-gdpr/
personally, I believe all this anonymity damages the internet and the society in general, but since anonymity is what we have and on that basis people post, it has to be respected
to be honest I would support a global online identification system anytime - that would decrease hate speech and also safeguard children from harmful exposure to bullying, deception and premature content
don't mind my username, that was more than 10 years ago, I'm a different person now, amazing how people change ^_^
