> But come on! It is a legitimate question, do you just scramble keys when picking an address?

I did give the answer: SLAAC.

> If your ISP gives you a static IPv6. Unfortunately in Germany none of the ISP for private users does (last I checked).

Weird, here in the UK all the ones I've had have given me a static /56. Still, the same answer for that (DDNS) exist as for dynamic IPv4 addresses, you still get the advantage of not having to deal with NAT.