Sounds like they get away with it legally because the law applies to ISPs and they’re not an ISP.
From your link:
> Internet service providers in Switzerland are obliged to take measures to prevent access to these domains (DNS blocking).
From your link:
> Internet service providers in Switzerland are obliged to take measures to prevent access to these domains (DNS blocking).
It still feels a little strange that that loophole is allowed: everyone who has a Swiss ISP could switch to Quad9 and be strictly better off. But if everyone does that, then the DNS ban is completely ineffectual. Maybe I should let sleeping dogs lie.