They market to activists and people concerned with the business of protest, not Swiss law experts - and are very much are not up front about what could happen if they are contact by LE. Of course They don’t hide it, but you won’t find it on the front page, where they trumpet about Swiss privacy.. You and I know the detail, many users may not.
At the end of the day, they attract a lot of activists and protesters to their service, with the offer of “safe and secure email. “ .
They hold a database of all them, in a jurisdiction that requires them to comply with legal requests for information.
They service some 6000 such requests from their database of every year, or around 30 per day.
You can decide for yourself who this efficient and eminently accessible single source of protesters information helps the most.