Another incident that tells us we need to move towards something more decentralized. Namecoin is an excellent concept and idea, it's a pity it is not used and supported more widely.
The only thing we know is that they were under sealed court order.
Namecoin is not a magical solution to every problem with domain registration, and it barely scratches the surface of the decentralization issue as it's pretty cheap for anyone with the budget of a nation state to 'recentralize' the namecoin system, let alone a $5 wrench.
When it comes to things being seized under sealed court order, the authorities usually don't have a problem finding a wrench.
It's not going to be something that legitimate companies are going to use for their primary domain name for a long time. More than that, it's going to be used in niche applications - decentralised identity (id/ rather than u/), primarily, along with being used as a name service for things like OpenBazaar and maybe Tor.
On the other hand, if you happen to run a company or project and have some form of cryptocurrency, you might as well exchange some of that for namecoins and register d/whatever, just in case.
In the vast majority of cases law enforcement and court actions against domains are justifiable and benefit the internet.
Based on what stats?