Earlier quoted context omitted.
The choice was either eliminate it now (globally, via introduction of a backdoor) or eliminate it in the UK (but keep it globally). So, perhaps this is a bit of a dangerous precedent, but it was the least-bad option.
When UK demanded a backdoor to e2ee in iMessage, Apple told them they’d rather get out of UK. Why not do the same here? You’re posing a false dichotomy.
The UK would still lose ADP (and then also just Apple products in general). A precedent would still be set.
Your posing a strictly worse third option. Sure, it's an option, I guess. Apple could also just close down globally, as a fourth option. Or sell off to Google as a fifth. But I was trying to present the least-bad option (turn off ADP), rather than an exhaustive list.