Why? Is that just on principle? Or do you see this behavior by the government as rising to the level of the US taking down sites that flout or even break the law in a de minimis way?
Keep in mind that to do what they did there is a level of case preparation required to get the proper signoffs to make this happen.
I think if someone is doing something illegal they have something to worry about, sure. But for 99.9% of the web sites out there why is this a cause for worry?
Edit (since I can't reply to below):
"the "convenience factor" of owning a .com no longer outweighs the potential risk"
The reason to own a .com is not convenience. It's ubiquity at least in the US. Speaking as someone in the business who deals with customers of registration domains all the time (and also with people buying valuable domains) at this time using a non .com domain is a non-starter for the majority of people.
I think it's a combination of several factors. One is definitely principle. The other major reason is that if I'm running a business from outside the US, and do not deal with US customers or business partners, why should I waste my time figuring out whether what I'm doing is contrary to some law in one US state, just to ensure that the US doesn't steal my domain from me?
Especially in some industries, there are vastly different notions of what is considered appropriate in the US vs. Europe (see the sports betting example). My opinion is that based on cases such as this, the "convenience factor" of owning a .com no longer outweighs the potential risk of losing the domain on the whim of the US government.
This can only be a boon for the .EU domain, ccTLDs and all their registers, especially those which allow second-level domain names like .de.
There is simply too much uncertainty with using American-hosted domains already and it is increasing every week.
And they're not being tried in those courts. Their domain has simply been seized because that's easier than winning in court.
If you are in one country, and are clearly and unambiguously doing business with someone in another country -- with written agreements, money/goods/etc. transferring -- then it's simply not a new idea that you may end up subject in some way to the laws of that other country. It also isn't a particularly scary idea.
The idea that "on the internet" is some sort of magical extra-jurisdictional space is the new and scary idea.
Non-US site, non-US registrar, non-US accounts/transactions.
Still seized by DHS. Because it's illegal in the US. That means you can be put on trial in any country in the world if you break any laws, anywhere. That's what the article is getting at.
"The reason to own a .com is not convenience. It's ubiquity at least in the US."
I know. I was not talking about the US.
"at this time using a non .com domain is a non-starter for the majority of people."
I disagree. For anyone who is not in the US (which is the majority of people), having a non-.com domain is probably not a big deal.