It did happen. Recently, the T-Mobile operator, instead of the already familiar picture with the pirate flag, gives this very page.

The blocking page says that the decision
was made on May 10 by the District Court of The Hague during the hearing of the case of Stichting Brein against T-Mobile Netherlands BV
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The court recommends to providers within ten days after the announcement of the decision to terminate access to the domain name and ip addresses of Pirate Bay.
The full text of the resolution can be found
here (Achtung, all in Dutch).
Apart from T-Mobile, the defendants in the case were also operators UPC, KPN and TELE2. The company Stichting Brein, who acted as the plaintiff, has been a local association of
filthy copyrights of the unseen lovers of copyright protection, who have been trying to
block access to The Pirate Bay since 2009. Until recently, providers somehow fought back, but were forced to give up.
Let me remind you that the clouds over the bay are gathering not only in the Netherlands. Thus, the decision to ban access to the site was recently
made in the UK. The Netherlands has recently
passed a law on network neutrality , according to which compulsory restriction of access to certain sites is possible only by a court decision. But The Pirate Bay is, as we see, did not help.
PS But the slogan T-Mobile looks funny.