What’s your company? Perhaps you have an ethical obligation to your users and should have these regulations in place. We’ve seen what happens when companies are underegulated (Facebook, etc etc)
And here’s why your argument is a fallacy:
“This type of argument is sometimes used as a form of fearmongering in which the probable consequences of a given action are exaggerated in an attempt to scare the audience” [1]
I don't have anything major to add to what I've already said. We have indeed an ethical obligation towards our (future) customers, that's exactly why we couldn't fulfill Ofcom's demands - that would literally be illegal in our jurisdiction. Sovereign countries have their own laws (not the UK's), and in addition to these we also provide strong moderation tools. So for now we have to block the UK. We're in closed alpha stage and have a long way to go so this is purely a matter of legal prudence.
By the way, I've worked closely together with argumentation theorists at university for many years, so I know quite well what a slippery slope argument is. You should know that not all of them are fallacies.
And here’s why your argument is a fallacy:
“This type of argument is sometimes used as a form of fearmongering in which the probable consequences of a given action are exaggerated in an attempt to scare the audience” [1]
1. https://en.wikipedia.org/wiki/Slippery_slope