Private address and static IP as an commercial offer.

I think, at least when I worked for the RIPE registry we did, the registry
only makes people aware of the technology and doesn't support or denounce
it.

This is as it should be. To NAT or not to NAT is often a business decision
that needs to be made by the end user. Keeping end users informed of such
technology is a good thing. Forcing people to either use it or not use it
would be a bad thing.

I get the impression that NATs are widely used throughout Europe. Often seen
as a way of addressing IP conservation issues and security at the same time.

Often people aren't aware of the disadvantages though.

JC