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That's a new claim, and it's also obvious bullshit.

First, I may be okay with it. And why would Posteo store WHOIS data? Unless they want to be a domain reseller, which is not what I asked them about.

Second, there are other TLDs.

I still insist that they do it because of lock-in and that they lie about it.

They wouldn't store whois data of course, but the domain needs to be stored at it can then be used to look it up.

I think mailbox.org supports custom domains and is similar in other respects.

That's a stupid excuse.

They should stop storing the mails themselves, they are full of private information. /s