I have a question about that. I'm currently developing a platform with strong end-to-end encryption. My servers only store the public keys of individual account

I have a question about that. I'm currently developing a platform with strong end-to-end encryption. My servers only store the public keys of individual accounts, the platform doesn't allow me to see what content people post or transmit without actively eavesdropping, and there are no means for me to moderate the content. However, there will be means for paying end-consumers to moderate the content of people they have invited. It's mostly intended as a collaborative tool for small business. However, other than steering it with marketing, I see no easy way for me to control who buys a subscription. From what I can gather, my tools will fall under the Online Safety Act and are incompatible with it. So how do I properly exclude all UK customers from purchasing subscriptions? Will it suffice to geo-block the website where you buy subscriptions?