さらに続報。ねんのため、whoisすると表示されるY!の
アドレスにメールしてみたんです。「ワタクシはあなたと話す
必要がありますね」と1行だけ書いて。

そしたら次のような返事。

After a long process of investigation, along with the Arbitration Forum, a
decision was taken that your domain name tahoo.com (TAHOO.COM) is violating
copyrights and trademarks owned by Yahoo! Inc.
In other words, Tahoo.com's traffic is generated by mistakenly typing
tahoo instead of yahoo and therefore violates US Laws of Copyrights and
Trademarks.
We are devoted, along with many registrars, Network Solutions is one of
them, to fight cybesquatting at its maximum to save are own brand.
I am sorry that your domain name tahoo.com has been legally ceased, but I
certainly know you understand that a Court decision for tahoo.com would have
cost you a lot more in arbitration fees but also in copyright infrigement
Yahoo! Inc. lawyers might have asked you to pay after all these years of
taking advantage of Yahoo! traffic.
We will transfer you back some domains that were moved by mistake as soon
as this matter is sealed.
Due to an excess of inquiries, please allow us 3 to 5 business days to
proceed.

脅し文句が入ってる？　入ってるよね？　cybesquattingは
cybersquattingの間違いですな。「ドメイン名を不正な目的で
登録・使用すること」だそうです。

とりあえず、現時点でのコメントは避けます。1週間ほど様子を
みましょうか。当欄の更新はすこし休みます。

追記：ワタクシはY!によるものではないと思ってます。
どこかのゴロツキが騙ってるだけ。愉快犯の側面がありそう。