> There is no reason for a reputable professional

I heard the same thing about private WHOIS data a decade ago, and this year, despite all registrars offering WHOIS privacy by default and most for free.

I don't think your point is valid.

> But then again, you are free to upload 8TB of your data

Exactly, let the market do whatever it wants. And of course I don't mind you discussing your own predilections and why you wouldn't use it, but the broad blanket statement is just naive and too simplistic.

That's because domains were increasingly registered to masses of private customers, who should have a different expectation of privacy than businesses. And privacy is a problem here. You cannot enforce a privacy policy (if there only was one) or data protection law against an anonymous website, so expect all your data to go to the highest bidder. Naively, maybe, I would expect that to be unacceptable, although there seem to be people in favour of this. It's possible that you'll get enough data later in the ordering process, but it's still highly unusable (compared to e.g. rsync.net and all the other big clouds).

I'm discussing the law in germany, which does not just apply to professional data center operators but to every site owner.

I have a very strong suspicion that’s nowhere near enforced to any reasonable degree of effectiveness for private individuals.

> But then again, you are free to upload 8TB of your data to an anonymous website that was created this morning.

Even if the provider registered a limited company to their name and used that, how would it help? Who would trust such a small entity with their data?

The service is clearly targeted at people who are knowledgeable enough not to upload unencrypted sensitive data.