Re: "The UK enacted GDPR through the Data Protection Act 2018 (DPA2018)"
I guess you meant 20-12-31, i.e. 31/12/2020, which I'd agree with.
Every Max Schrems victory since then either in court or in a DPA ruling means nothing in the UK. There's quite a lot of news from 2021 on NOYB's website.
Biting the hand that feeds IT
